Maths-
General
Easy

Question

If vertical line a cross times b vertical line equals 4 and vertical line a. b vertical line equals 2, then vertical line a vertical line to the power of 2 end exponent vertical line b vertical line to the power of 2 end exponent equals

  1. 2    
  2. 6    
  3. 8    
  4. 20    

The correct answer is: 20


    Given vertical line a cross times b vertical line equals 4 rightwards double arrow open vertical bar vertical line a vertical line vertical line b vertical line sin invisible function application theta stack n with hat on top close vertical bar equals 4
    rightwards double arrow open vertical bar rightwards arrow over short leftwards arrow vertical line a vertical line vertical line b vertical line sin invisible function application theta close vertical bar equals 4 …..(i)
    Also vertical line a. b vertical line equals 2 rightwards double arrow open vertical bar vertical line a vertical line vertical line b vertical line cos invisible function application theta close vertical bar equals 2
    rightwards double arrow open vertical bar vertical line a vertical line vertical line b vertical line cos invisible function application theta close vertical bar equals 2 …..(ii)
    Now squaring and adding equation (i) and (ii), we get
    vertical line a vertical line to the power of 2 end exponent. vertical line b vertical line to the power of 2 end exponent sin to the power of 2 end exponent invisible function application theta plus vertical line a vertical line to the power of 2 end exponent. vertical line b vertical line to the power of 2 end exponent cos to the power of 2 end exponent invisible function application theta equals 4 to the power of 2 end exponent plus 2 to the power of 2 end exponent
    therefore vertical line a vertical line to the power of 2 end exponent. vertical line b vertical line to the power of 2 end exponent left parenthesis sin to the power of 2 end exponent invisible function application theta plus cos to the power of 2 end exponent invisible function application theta right parenthesis equals 16 plus 4
    rightwards double arrow vertical line a vertical line to the power of 2 end exponent. vertical line b vertical line to the power of 2 end exponent cross times 1 equals 20.

    Related Questions to study

    General
    Maths-

    Let u = i + j, v = i – j and w = i + 2j + 3k. If n is a unit vector such that u.n = 0 and v.n = 0 then vertical line w. n vertical line is equal to

    Let u = i + j, v = i – j and w = i + 2j + 3k. If n is a unit vector such that u.n = 0 and v.n = 0 then vertical line w. n vertical line is equal to

    Maths-General
    General
    Maths-

    Angle between the line r equals left parenthesis i plus 2 j minus k right parenthesis plus lambda rightwards arrow over short leftwards arrow left parenthesis i minus j plus k right parenthesis and the normal to the plane r. left parenthesis 2 i minus j plus k right parenthesis equals 4 is

    Angle between the line r equals left parenthesis i plus 2 j minus k right parenthesis plus lambda rightwards arrow over short leftwards arrow left parenthesis i minus j plus k right parenthesis and the normal to the plane r. left parenthesis 2 i minus j plus k right parenthesis equals 4 is

    Maths-General
    General
    Maths-

    left square bracket left parenthesis a cross times b right parenthesis cross times left parenthesis b cross times c right parenthesis left parenthesis b cross times c right parenthesis cross times left parenthesis c cross times a right parenthesis left parenthesis c cross times a right parenthesis cross times left parenthesis a cross times b right parenthesis right square bracket equals

    left square bracket left parenthesis a cross times b right parenthesis cross times left parenthesis b cross times c right parenthesis left parenthesis b cross times c right parenthesis cross times left parenthesis c cross times a right parenthesis left parenthesis c cross times a right parenthesis cross times left parenthesis a cross times b right parenthesis right square bracket equals

    Maths-General
    parallel
    General
    Maths-

    If u equals 2 i plus 2 j minus kand v equals 6 i minus 3 j plus 2 k comma then a unit vector perpendicular to both u and v is

    If u equals 2 i plus 2 j minus kand v equals 6 i minus 3 j plus 2 k comma then a unit vector perpendicular to both u and v is

    Maths-General
    General
    Maths-

    The equation of plane passing through a point A left parenthesis 2 comma negative 1 , 3 right parenthesis and parallel to the vectors a equals left parenthesis 3 , 0 comma negative 1 right parenthesis and b equals left parenthesis negative 3 , 2 comma 2 right parenthesis is

    The equation of plane passing through a point A left parenthesis 2 comma negative 1 , 3 right parenthesis and parallel to the vectors a equals left parenthesis 3 , 0 comma negative 1 right parenthesis and b equals left parenthesis negative 3 , 2 comma 2 right parenthesis is

    Maths-General
    General
    Maths-

    The equation of the plane passing through the points left parenthesis negative 1 comma negative 2 , 0 right parenthesis comma left parenthesis 2 , 3 comma 5 right parenthesis and parallel to the line
    r equals negative 3 j plus k plus lambda left parenthesis 2 i plus 5 j minus k right parenthesis is

    The equation of the plane passing through the points left parenthesis negative 1 comma negative 2 , 0 right parenthesis comma left parenthesis 2 , 3 comma 5 right parenthesis and parallel to the line
    r equals negative 3 j plus k plus lambda left parenthesis 2 i plus 5 j minus k right parenthesis is

    Maths-General
    parallel
    General
    Maths-

    The distance from the point negative i plus 2 j plus 6 k to the straight line through the point (2, 3, –4) and parallel to the vector 6 i plus 3 j minus 4 k is

    The distance from the point negative i plus 2 j plus 6 k to the straight line through the point (2, 3, –4) and parallel to the vector 6 i plus 3 j minus 4 k is

    Maths-General
    General
    Maths-

    The length of the perpendicular from the origin to the plane passing through three non-collinear points a comma b comma c is

    The length of the perpendicular from the origin to the plane passing through three non-collinear points a comma b comma c is

    Maths-General
    General
    Maths-

    A vector n of magnitude 8 units is inclined to x-axis at 4 5 to the power of o end exponent, y-axis at 6 0 to the power of o end exponent and an acute angle with z-axis. If a plane passes through a point left parenthesis square root of 2 comma negative 1 , 1 right parenthesis and is normal to n, then its equation in vector form is

    A vector n of magnitude 8 units is inclined to x-axis at 4 5 to the power of o end exponent, y-axis at 6 0 to the power of o end exponent and an acute angle with z-axis. If a plane passes through a point left parenthesis square root of 2 comma negative 1 , 1 right parenthesis and is normal to n, then its equation in vector form is

    Maths-General
    parallel
    General
    Maths-

    fraction numerator text d end text over denominator text dx end text end fraction open square brackets s i n open parentheses l o g open parentheses s i n e to the power of x to the power of 2 end exponent end exponent close parentheses close parentheses close square brackets =

    fraction numerator text d end text over denominator text dx end text end fraction open square brackets s i n open parentheses l o g open parentheses s i n e to the power of x to the power of 2 end exponent end exponent close parentheses close parentheses close square brackets =

    Maths-General
    General
    Maths-

    If square root of T a n y end root = e to the power of c o s 2 x end exponent. s i n x comma blank t h e n blank fraction numerator text dy end text over denominator text dx end text end fraction =

    If square root of T a n y end root = e to the power of c o s 2 x end exponent. s i n x comma blank t h e n blank fraction numerator text dy end text over denominator text dx end text end fraction =

    Maths-General
    General
    Maths-

    The line chi plus gamma equals 2 is tangent to tthe curve chi to the power of 2 end exponent equals 3 minus 2 gamma at its point

    The line chi plus gamma equals 2 is tangent to tthe curve chi to the power of 2 end exponent equals 3 minus 2 gamma at its point

    Maths-General
    parallel
    General
    General

    In general  calcium carbonate is not soluble in water but by the addition of carbon dioxide to it,  it becomes soluble. This is because:

    In general  calcium carbonate is not soluble in water but by the addition of carbon dioxide to it,  it becomes soluble. This is because:

    GeneralGeneral
    General
    Chemistry-

    The correct stability order for the following species is:
    I)
    II)
    III)
    IV) 

    The correct stability order for the following species is:
    I)
    II)
    III)
    IV) 

    Chemistry-General
    General
    Maths-

    The point (4,3) is translated to the point (3,1) and then axes rotated through 30º about the origin then the new position of point is

    The point (4,3) is translated to the point (3,1) and then axes rotated through 30º about the origin then the new position of point is

    Maths-General
    parallel

    card img

    With Turito Academy.

    card img

    With Turito Foundation.

    card img

    Get an Expert Advice From Turito.

    Turito Academy

    card img

    With Turito Academy.

    Test Prep

    card img

    With Turito Foundation.