$\left(\sqrt{x+y}\cdot\sqrt{x-y}\right)$
$\int\frac{1}{\left(x-4\right)\left(x+4\right)}dx$
$\frac{d^4}{dx^4}\left(13e^{x^2}\right)$
$\frac{\sin\left(5x\right)}{\sin\left(x\right)}-\frac{\cos\left(5x\right)}{\cos\left(x\right)}=4\cos\left(2x\right)$
$y'=2^{x-y}$
$x^2-18x+45$
$( 3 b ^ { - 2 } ) ^ { 2 } ( a ^ { 2 } b ^ { 4 } ) ^ { 3 }$
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