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

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==== QUESTION TEXT ====

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

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