$\int-\frac{sin\left(x\right)}{cos\left(x\right)}dx$
$-2\left(x+2\right)-5x$
$4-2x^2<5-4x$
$\int\frac{9x}{\left(3-x^2\right)^3}dx$
$-\left(-6x+2y-4\right)$
$\lim\:_{x\to\:\:b}\left(\frac{x^3-b^3}{x-b}\right)$
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