$\lim_{x\to2\pi}\left(\frac{\sin\left(6x\right)}{\sin\left(3x\right)}\right)$
$\int x\left(e^{2x}-1\right)dx$
$2\left(-2\right)\left(4\right)$
$cos2x\:+\:2\:cos\:x\:+\:1\:=\:0$
$x^2-\frac{1}{4}x+x^2-\frac{x}{4}$
$\frac{d}{dx}3x^2+6lnxz-4yx^2+4e^z$
$-239+351$
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