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Math Help - derivative

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    derivative

    e^z cos z
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    Re: derivative

    \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*}

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    Re: derivative

    thank you
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