e^z cos z
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$\displaystyle \displaystyle \begin{align*} \frac{d}{dz} \left[ e^z \cos{(z)} \right] &= e^z\, \frac{d}{dz} \left[ \cos{(z)} \right] + \cos{(z)}\,\frac{d}{dz} \left( e^z \right) \end{align*}$ Go from here.
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