Maths-
General
Easy

Question

If y equals c o s to the power of negative 1 end exponent invisible function application open parentheses fraction numerator a to the power of 2 end exponent minus x to the power of 2 end exponent over denominator a to the power of 2 end exponent plus x to the power of 2 end exponent end fraction close parentheses plus s i n to the power of negative 1 end exponent invisible function application open parentheses fraction numerator 2 a x over denominator a to the power of 2 end exponent plus x to the power of 2 end exponent end fraction close parentheses text  then  end text fraction numerator d y over denominator d x end fraction equals

  1. fraction numerator 4 a over denominator x to the power of 2 end exponent plus a to the power of 2 end exponent end fraction    
  2. fraction numerator 2 a over denominator x to the power of 2 end exponent plus a to the power of 2 end exponent end fraction    
  3. fraction numerator a over denominator x to the power of 2 end exponent plus a to the power of 2 end exponent end fraction    
  4. fraction numerator a over denominator x to the power of 2 end exponent plus a to the power of 2 end exponent end fraction    

hintHint:

We are given a function. We have to find the derivate of this function.

The correct answer is: fraction numerator 4 a over denominator x to the power of 2 end exponent plus a to the power of 2 end exponent end fraction


    y space equals space cos to the power of negative 1 end exponent open parentheses fraction numerator a squared minus x squared over denominator a squared plus x squared end fraction close parentheses space plus space sin to the power of negative 1 end exponent open parentheses fraction numerator 2 a x over denominator a squared plus x squared end fraction close parentheses
    We have to find the derivate of this function.
    Before finding the derivate, we will try to simplify the function.
    Let's simplify the equation.
    We will substitute x = atanθ in the equation.
    W e space w i l l space t a k e space t h e space p a r t s space o f space t h e space e q u a t i o n space a n d space s u b s t i t u t e space t h e space v a l u e
fraction numerator a squared space minus space x squared over denominator a squared space plus space x squared end fraction space equals space fraction numerator a squared minus space left parenthesis a tan theta right parenthesis squared over denominator a space plus space left parenthesis a tan theta right parenthesis squared end fraction
space space space space space space space space space space space space space space space space space space equals fraction numerator a squared minus a squared tan squared theta over denominator a squared plus a squared tan squared theta end fraction
space space space space space space space space space space space space space space space space space space equals fraction numerator a squared left parenthesis 1 space minus space tan squared theta right parenthesis over denominator a squared left parenthesis 1 space plus space tan squared theta right parenthesis end fraction
space space space space space space space space space space space space space space space space space space equals fraction numerator left parenthesis 1 space minus space tan squared theta right parenthesis over denominator left parenthesis 1 space plus space tan squared theta right parenthesis end fraction
space space space space space space space space space space space space space space space space space space space equals space cos 2 theta space space space space space space space space space space space space space space space space space space space space space... left parenthesis space f o r m u l a space o f space cos 2 x right parenthesis
fraction numerator a squared minus x squared over denominator a squared plus x squared end fraction space equals space cos 2 theta
W e space w i l l space s u b s t i t u t e space t h i s space v a l u e space i n space t h e space e q u a t i o n
    Now, we will take this value.
    open parentheses fraction numerator 2 a x over denominator a squared plus space x squared end fraction close parentheses space equals space open square brackets fraction numerator 2 a left parenthesis a tan theta right parenthesis over denominator a squared plus left parenthesis a tan theta right parenthesis squared end fraction close square brackets
space space space space space space space space space space space space space space space space space space space space equals open parentheses fraction numerator 2 a squared tan theta over denominator a squared plus a squared tan squared theta end fraction close parentheses
space space space space space space space space space space space space space space space space space space space equals open parentheses fraction numerator 2 tan theta over denominator 1 space plus tan squared theta end fraction close parentheses
space space space space space space space space space space space space space space space space space space space equals space sin 2 theta space space space space space space space space space space space space... left parenthesis f o r m u l a space o f space sin 2 x right parenthesis
    We have the simplified values now. We will resubstitute in the equation.
    y space equals cos to the power of negative 1 end exponent left parenthesis cos 2 theta right parenthesis space plus space sin to the power of negative 1 end exponent left parenthesis sin 2 theta right parenthesis
space space space space space equals space 2 theta space plus space 2 theta space space space space space space space space space space space space space space space space space space space
y space space space equals space 4 theta
A s comma space cos to the power of negative 1 end exponent left parenthesis cos A right parenthesis space equals space A
space space space space space space space sin to the power of negative 1 end exponent left parenthesis sin A right parenthesis space equals A
    Now, we will resubstitute the value of x.
    x space equals space a tan theta
R e a r r a n g i n g space a n d space d i v i d i n g space b y space a
tan theta space equals x over a
T a k i n g space tan space i n v e r s e
tan to the power of negative 1 end exponent left parenthesis tan theta right parenthesis space equals tan to the power of negative 1 end exponent open parentheses x over a close parentheses
space space space space space space space space space space space space space space space space space theta space equals tan to the power of negative 1 end exponent open parentheses x over a close parentheses
    So, the equation becomes.
    y space equals space 4 tan to the power of negative 1 end exponent open parentheses x over a close parentheses
N o w comma space w e space w i l l space d i f f e r n t i a t e space w. r. t space x
fraction numerator d y over denominator d x end fraction equals 4 open square brackets fraction numerator 1 over denominator 1 space plus space open parentheses begin display style x over a end style close parentheses squared end fraction close square brackets fraction numerator d over denominator d x end fraction open parentheses x over a close parentheses
space space space space
space space space A s comma space tan to the power of negative 1 end exponent left parenthesis a right parenthesis space equals space fraction numerator 1 over denominator 1 space plus space a squared end fraction

fraction numerator d y over denominator d x end fraction space equals space 4 open square brackets fraction numerator a squared over denominator a squared plus space x squared end fraction close square brackets open parentheses 1 over a close parentheses
fraction numerator d y over denominator d x end fraction equals fraction numerator 4 a over denominator a squared space plus space x squared end fraction
space space space space space space space space
    This is the derivative of the given function.

    For such questions, we should know the formulas of inverse functions.

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