$1-tan^2\:x\:=\:2-\sec^2\:x$
$0-\left(-15\right)$
$\lim_{x\to1}\left(\frac{-1+x}{x-1}\right)$
$-6x^2-4x^9+6x^2-3x^9$
$6x^2-13x-5=0$
$sin\left(r-\frac{\pi}{4}\right)$
$\left(5n\right)\left(-4n^2\right)$
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