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Questions  >>  CBSE XII  >>  Math  >>  Model Papers
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If $x= \bigg( \cos\theta + \log \tan\large\frac{\theta}{2} \bigg), $$y=\sin\: \theta, \large\frac{d^2y}{dx^2}$$\: at \: \theta=\large\frac{\pi}{4} $

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