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Question

If z is a complex number such that vertical line equals vertical line greater or equal than 2 then the minimum value of ∣ z plus fraction numerator 1 over denominator 2 end fraction is is strictly

  1. greater than fraction numerator 5 over denominator 2 end fraction is strictly    
  2. greater than fraction numerator 3 over denominator 2 end fraction but    
  3. less than fraction numerator 5 over denominator 2 end fraction is equal to fraction numerator 5 over denominator 2 end fraction    
  4. lies in the interval left parenthesis 12 right parenthesis    

The correct answer is: lies in the interval left parenthesis 12 right parenthesis


    We are given that z is a complex number then we are asked to find the minimum value of |z+1/2|
    vertical line space z space vertical line space greater or equal than space 2 space space i s space t h e space r e g i o n space o n space o r space o u t s i d e space o f space c i r c l e space w h o s e space C e n t r e space i s space left parenthesis 0 comma 0 right parenthesis space a n d space a space r a d i u s space i s space 2.
space M i n i m u m space space ∣ space ∣ space z space plus space 1 half ∣ space ∣ space space i s space d i s tan c e space o f space z comma space w h i c h space l i e space o n space c i r c l e space vertical line space z space 1 space vertical line space equals space 2 space space f r o m space space left parenthesis space minus space 1 space 2 space comma space 0 space right parenthesis space.
space therefore space space M i n i m u m space space ∣ space ∣ space z space plus 1 half space space ∣ space ∣ space space equals space D i s tan c e space o f space space left parenthesis space minus space 1 space 2 space comma space 0 space right parenthesis space space f r o m space left parenthesis negative 2 comma 0 right parenthesis space equals space √ space left parenthesis space minus space 2 space plus space 1 half space right parenthesis squared space plus space 0 space equals space fraction numerator 3 over denominator 2 end fraction space H e n c e comma space m i n i m u m space v a l u e space o f space space ∣ space ∣ space z space plus space 1 half space ∣ space ∣ space space l i e s space i n space t h e space i n t e r v a l space left parenthesis 1 comma 2 right parenthesis.

    Therefore the correct option is choice 4

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    If open vertical bar fraction numerator z subscript 1 end subscript over denominator z subscript 2 end subscript end fraction close vertical bar equals 1 and a r g invisible function application open parentheses z subscript 1 end subscript z subscript 2 end subscript close parentheses equals 0 then

    Therefore the correct option is choice 3

    If open vertical bar fraction numerator z subscript 1 end subscript over denominator z subscript 2 end subscript end fraction close vertical bar equals 1 and a r g invisible function application open parentheses z subscript 1 end subscript z subscript 2 end subscript close parentheses equals 0 then

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    Therefore the correct option is choice 3

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    One of the values of open parentheses cis invisible function application fraction numerator pi over denominator 6 end fraction close parentheses to the power of fraction numerator 1 over denominator 2 end fraction end exponent plus open parentheses cis invisible function application fraction numerator negative pi over denominator 6 end fraction close parentheses to the power of fraction numerator 11 over denominator 2 end fraction end exponent

    One of the values of open parentheses cis invisible function application fraction numerator pi over denominator 6 end fraction close parentheses to the power of fraction numerator 1 over denominator 2 end fraction end exponent plus open parentheses cis invisible function application fraction numerator negative pi over denominator 6 end fraction close parentheses to the power of fraction numerator 11 over denominator 2 end fraction end exponent

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    If the distance between the points left parenthesis a c o s invisible function application theta comma a s i n invisible function application theta right parenthesis, left parenthesis a c o s invisible function application ϕ comma a s i n invisible function application ϕ right parenthesis is 2 a
    then theta equals 6
    Assertion (A): If 2 s i n invisible function application fraction numerator theta over denominator 2 end fraction equals square root of 1 plus s i n invisible function application theta end root plus square root of 1 minus s i n invisible function application theta end root, then fraction numerator theta over denominator 2 end fraction lies between
    2 n pi plus fraction numerator pi over denominator 4 end fraction text  and  end text 2 n pi plus fraction numerator 3 pi over denominator 4 end fraction left parenthesis n element of z right parenthesis
    Reason left parenthesis R right parenthesis colon If fraction numerator theta over denominator 2 end fraction element of open parentheses fraction numerator pi over denominator 4 end fraction comma fraction numerator 3 pi over denominator 4 end fraction close parentheses, then s i n invisible function application fraction numerator theta over denominator 2 end fraction greater than 0

    If the distance between the points left parenthesis a c o s invisible function application theta comma a s i n invisible function application theta right parenthesis, left parenthesis a c o s invisible function application ϕ comma a s i n invisible function application ϕ right parenthesis is 2 a
    then theta equals 6
    Assertion (A): If 2 s i n invisible function application fraction numerator theta over denominator 2 end fraction equals square root of 1 plus s i n invisible function application theta end root plus square root of 1 minus s i n invisible function application theta end root, then fraction numerator theta over denominator 2 end fraction lies between
    2 n pi plus fraction numerator pi over denominator 4 end fraction text  and  end text 2 n pi plus fraction numerator 3 pi over denominator 4 end fraction left parenthesis n element of z right parenthesis
    Reason left parenthesis R right parenthesis colon If fraction numerator theta over denominator 2 end fraction element of open parentheses fraction numerator pi over denominator 4 end fraction comma fraction numerator 3 pi over denominator 4 end fraction close parentheses, then s i n invisible function application fraction numerator theta over denominator 2 end fraction greater than 0

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    If c o s e c to the power of 6 end exponent invisible function application q minus c o t to the power of 6 end exponent invisible function application q equals a c o t to the power of 4 end exponent invisible function application q plus b c o t to the power of 2 end exponent invisible function application q plus c then a+b+c=

    So here we have used the trigonometric functions and trigonometric formulas to solve this, the algebraic expressions were used to formulate it. Here the answer of a+b+c is 7.

    If c o s e c to the power of 6 end exponent invisible function application q minus c o t to the power of 6 end exponent invisible function application q equals a c o t to the power of 4 end exponent invisible function application q plus b c o t to the power of 2 end exponent invisible function application q plus c then a+b+c=

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    So here we have used the trigonometric functions and trigonometric formulas to solve this, the algebraic expressions were used to formulate it. Here the answer of a+b+c is 7.

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    If a,b,c are the sides of the triangle ABC such that open parentheses 1 plus fraction numerator b minus c over denominator a end fraction close parentheses to the power of a end exponent open parentheses 1 plus fraction numerator c minus a over denominator b end fraction close parentheses to the power of b end exponent open parentheses 1 plus fraction numerator a minus b over denominator c end fraction close parentheses to the power of c end exponent greater or equal than 1
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    If a,b,c are the sides of the triangle ABC such that open parentheses 1 plus fraction numerator b minus c over denominator a end fraction close parentheses to the power of a end exponent open parentheses 1 plus fraction numerator c minus a over denominator b end fraction close parentheses to the power of b end exponent open parentheses 1 plus fraction numerator a minus b over denominator c end fraction close parentheses to the power of c end exponent greater or equal than 1
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    If s i n invisible function application y equals x s i n invisible function application left parenthesis a plus y right parenthesis and fraction numerator d y over denominator d x end fraction equals fraction numerator A over denominator 1 plus x to the power of 2 end exponent minus 2 x c o s invisible function application a end fraction then the value of blank to the power of ´ end exponent A ' is

    Therefore the correct option is choice 3

    If s i n invisible function application y equals x s i n invisible function application left parenthesis a plus y right parenthesis and fraction numerator d y over denominator d x end fraction equals fraction numerator A over denominator 1 plus x to the power of 2 end exponent minus 2 x c o s invisible function application a end fraction then the value of blank to the power of ´ end exponent A ' is

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    Therefore the correct option is choice 3

    parallel
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    The maximum value of open parentheses c o s invisible function application alpha subscript 1 end subscript close parentheses open parentheses c o s invisible function application alpha subscript 2 end subscript close parentheses horizontal ellipsis horizontal ellipsis. open parentheses c o s invisible function application alpha subscript n end subscript close parentheses under the restriction
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    parallel

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