If z = e ^ (xy ^ 2), x = tcost, and y = tsint compute dx / dt for t = pi / 2(adsbygoogle = window.adsbygoogle || []).push({});

I kind of lost in this difficult question pls help

I tried putting down the xy but using ln

lnz = xy^2

Product rule? Or what. This is my first time encountering this kind of question

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# Differential Calculus Question

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