$cot\:a\:=\frac{1}{2}\left(\cot\:\left(\frac{a}{2}\right)\tan\:\left(\frac{a}{2}\right)\right)$
$\int\cot\left(-3x-2\right)dx$
$3\sin^2z=4\cos^2z$
$\lim_{x\to0}\left(\frac{\sin\left(x\right).2x}{x^3}\right)$
$\frac{x^8+5x^7+3x^2+x+8}{x^2-1}$
$458+1322$
$5x^3-7x^2+9x-5x-x^2+10x^3$
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