$\frac{cos^2x-sin^2x}{2sinx\:cosx}=cot2x$
$\frac{x^2-3x+2}{x-5}$
$6\left(4\right)\left(2\right)+-5\left(2\right)\left(-5\right)+-12\left(-3\right)$
$\frac{1}{4}t-\frac{1}{2}=\frac{1}{8}t$
$\lim_{x\to0}\left(\frac{5x+tan\left(4x\right)}{3x-tan\left(5x\right)}\right)$
$sen^2x-\frac{1}{2}=0$
$-6x+2x+2x-6+6+2y+2x+2y$
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