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If y = sin(sin x), prove that (d^2y/dx^2) + tan x.(dy/dx) + y cos^2 x = 0

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If y = sin(sin x), prove that (d2y/dx2) + tan x.(dy/dx) + y cos2 x = 0

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Suppose y = sin(sin x) ...(1)

Finding dy/dx 

On differentiating with respect to x

 ...(2)

Again, on differentiating with respect to x

Using eqn. 2

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