$\int\frac{sinx+2}{3cosx}dx$
$x+3yz+y+3xz$
$\frac{x-10}{2}=y+50$
$\lim_{x\to0}\left(cos\left(2x\right)^{\frac{1}{x}}\right)$
$\frac{cos\left(2x\right)}{sin^2x}$
$7x^3+2x+\frac{x^3}{2}-2x$
$-\left(4-3+9-11\right)-\left(-3+5\right)$
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