$-1-\left|1-\left(-7-2+1\right)\right|$
$\frac{1-cos^2\:x}{cos^2\:x}=\left(\frac{sin\:x}{cos\:x}\right)$
$3x^2y-2xy^2;\:x=-2;\:y=3$
$sqrt\left(x^2\:-\:1\right)\:=\:sqrt\left(x\:+\:2\right)$
$x-5x-50$
$\lim_{x\to0}\left(\frac{1}{x-12}-\frac{1}{\sqrt{x-12}}\right)$
$\cos a\:+\:cos\:a\:\cdot\:tan^2\:a\:$
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