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If x= cos t+ log tan t/2 and y = sin t, ...

If x= cos t+ log tan t/2 and y = sin t, then find the value of `(d^2y)/(dt^2) and (d^2y)/(dx^2) at t= (pi)/4`.

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SHARAM PUBLICATION-CONTINUITY AND DIFFERENTIABILITY-EXAMPLE
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  11. If x = (1-cos^2 theta)/(cos theta), y = (1-cos^(2n)theta)/(cos^n theta...

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