The derivative $\frac{d}{dx}\left(x^{\cos\left(y\right)}\right)$ results in $\left(-\sin\left(x^{\cos\left(y\right)}\right)\ln\left(x\right)+\frac{\cos\left(x^{\cos\left(y\right)}\right)}{x}\right)x^{\cos\left(y\right)}$
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