$4\left(-2n-5\right)+9n$
$\cos\left(75\right)\sin\left(15\right)$
$\int x\sqrt{x-13}dx$
$\int\frac{\left(x^3+x-1\right)}{x^2+1}\:dx$
$\frac{d}{dx}\cot\left(10x^8\right)$
$x^2-5x=10$
$\frac{dx}{dt}=\frac{cos\left(t\right)}{sin\left(x\right)}$
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