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Question

If x=sinθ, y=cos2θ, find d2ydx2

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Solution

x=sinθ,
dxdθ=cosθ
and
y=cos2θ,
dydθ=2sin2θ .
Now,
dydx=2sin2θcosθ
or, dydx=4sinθcosθcosθ
or, dydx=4sinθ
or,dydx=4x
or,d2ydx2=4

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