Maths-
General
Easy

Question

If y equals s i n invisible function application 2 x s i n invisible function application 3 x s i n invisible function application 4 x text  then  end text y to the power of parallel to end exponent equals

  1. fraction numerator 1 over denominator 4 end fraction left parenthesis 81 s i n invisible function application 9 x minus 25 s i n invisible function application 5 x minus 9 s i n invisible function application 3 x plus s i n invisible function application x right parenthesis    
  2. fraction numerator 1 over denominator 4 end fraction left parenthesis 81 s i n invisible function application 9 x minus 25 s i n invisible function application 5 x minus 9 s i n invisible function application 3 x minus s i n invisible function application x right parenthesis    
  3. fraction numerator 1 over denominator 4 end fraction left parenthesis 81 s i n invisible function application 9 x minus 25 s i n invisible function application 5 x minus 6 s i n invisible function application 3 x minus s i n invisible function application x right parenthesis    
  4. none of these    

hintHint:

We are given a function. We have to find the double derivative of the function. Before finding the second derivative, we will simplify the equation.

The correct answer is: fraction numerator 1 over denominator 4 end fraction left parenthesis 81 s i n invisible function application 9 x minus 25 s i n invisible function application 5 x minus 9 s i n invisible function application 3 x minus s i n invisible function application x right parenthesis


    The given function is as follows:
    y = sin2xsin3xsin4x
    y space equals space sin 2 x sin 3 x sin 4 x

W e space w i l l space u s e space t h e space f o r m u l a
sin A. sin B space equals space 1 half left square bracket cos left parenthesis A plus B right parenthesis space minus cos left parenthesis A minus B right parenthesis right square bracket
sin 3 x. sin 2 x space equals space 1 half left square bracket cos left parenthesis 3 x space plus space 2 x right parenthesis space minus space cos left parenthesis 3 x minus 2 x right parenthesis right square bracket
space space space space space space space space space space space space space space space space space space space space space space equals 1 half left parenthesis cos 5 x space minus space cos x right parenthesis
W e space w i l l space s u b s t i t u t e space t h i s space i n space a b o v e space e q u a t i o n.

space space space space space space space space space space space space
    y space equals 1 half left parenthesis cos 5 x space minus space cos x right parenthesis sin 4 x
space space space space equals 1 half left parenthesis cos 5 x sin 4 x space minus cos x sin 4 x right parenthesis
    W e space w i l l space u s e space t h e space f o r m u l a space

sin A. cos B space equals 1 half left parenthesis sin left parenthesis A plus B right parenthesis space plus space sin left parenthesis A minus B right parenthesis
sin 4 x cos 5 x space equals 1 half left square bracket sin left parenthesis 4 x space plus space 5 x right parenthesis space plus space left parenthesis sin 4 x space minus 5 x right parenthesis right square bracket
space space space space space space space space space space space space space space space space space space space space space space equals 1 half left square bracket sin 9 x space plus space sin left parenthesis negative x right parenthesis right square bracket
space space space space space space space space space space space space space space space space space space space space space space equals space 1 half left parenthesis sin 9 x space minus sin x right parenthesis
sin 4 x cos x space equals space 1 half left square bracket sin left parenthesis 4 x space plus space x right parenthesis space plus space sin left parenthesis 4 x minus x right parenthesis right square bracket
space space space space space space space space space space space space space space space space space space space space equals 1 half left parenthesis sin 5 x space plus space sin 3 x right parenthesis
    We will resubstitute the values.
    y space equals 1 half open square brackets 1 half left parenthesis sin 9 x space minus space sin x right parenthesis minus 1 half left parenthesis sin 5 x plus sin 3 x right parenthesis close square brackets
y space equals space 1 fourth left parenthesis sin 9 x minus sin x space minus sin 5 x minus sin 3 x right parenthesis
T a k i n g space d e r i v a t i v e
y apostrophe space equals 1 fourth left parenthesis 9 cos 9 x space minus space cos x space minus 5 cos 5 x space minus 3 cos 3 x right square bracket
y " space equals 1 fourth left square bracket 81 left parenthesis negative sin 9 x right parenthesis space minus left parenthesis negative sin x right parenthesis space minus 25 left parenthesis negative sin 5 x right parenthesis minus 9 left parenthesis negative sin 3 x right parenthesis right square bracket
space y " space equals space 1 fourth left parenthesis negative 81 sin 9 x space plus space sin x space plus 25 sin 5 x space plus 9 sin 3 x right parenthesis
    None of the option matches.
    So, right option is "none of these".

    For such questions, we should know different formulas.

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