$cos\:t\:=-\frac{4}{5}$
$\frac{dy}{dx}\left(y=13\right)$
$f\left(x\right)=-4+\frac{2}{5}x$
$\int\frac{x}{\sqrt{x^2\cdot1}}dx$
$2x^2+x-400=0$
$\int\left(sec12wtan12w\right)dw$
$\left(x-3\right)\left(x+2\right)+9x\:\left(x^2-5\right)-1$
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