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If x = a (cos θ + log tan θ/2) and y = a sin θ, show that the value of d^2y/dx^2 at θ = π/4 is 2√2/a.

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If x = a (cos θ + log tan θ/2) and y = a sin θ, show that the value of d2y/dx2 at θ = π/4 is 2√2/a.

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Differentiating with respect to x

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