$15-5\cdot2+4\cdot5$
$\lim_{x\to\infty}\left(\frac{1+x^2-\cos\left(6x\right)}{1-x^2-\cos\left(4x\right)}\right)$
$\int2xcos\frac{x}{3}dx$
$\frac{dy}{dq}=\frac{1000}{\sqrt{1009}}$
$w^2-3w-40$
$2tanx+3=1$
$\cos^2+\cos^2\cdot\cot^2$
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