$\left(-6\right)\left(-15\right)$
$8x+8+9+7x$
$\frac{d}{dx}y=x^2+3x^5+4$
$\frac{\left(sin\left(6w\right)-sin\left(2w\right)\right)}{\left(cos\left(6w\right)-cos\left(2w\right)\right)}$
$w=x^2y-y$
$7m+5\left(-2m+7\right)$
$\int\:2e^{-2x}dx$
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