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Q.

If f(x)=sinsin x and f''(x)+ tan x f''(x)+g(x)=0, then g(x) is: 

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a

cos2x cossin x

b

cos2 x sin sin x

c

sin2 x sincos x

d

sin2 x coscos x

answer is D.

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Detailed Solution

f(x)=sin(sin x) f1(x)=cos (sin x) cos x f11x=-sin (sin x) cos2x-sin x cos(sin x) f11(x)+tan x f1(x)+g(x)=0 g(x)=-f11(x)-f1(x) tan x        =sin (sin x) cos2x+sin x cos(sin x)-sinxcos xcos (sin x) cos x        =sin (sin x) cos2x.                     

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