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If x= in tan (θ/2), y= tan θ, prove that (d^2y/dx^2)= tan^2θsinθ(cosθ+2secθ)?
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If x= in tan (θ/2), y= tan θ, prove that (d^2y/dx^2)= tan^2θsinθ(cosθ+2secθ)?
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