$\left(1+cot\left(x\right)\right)\left(1-cot\left(x\right)\right)$
$\int\left(1+3t\right)t^2\:dt$
$2\left(sinx\right)^2+5\left(cosx\right)^2=3$
$-3\left(4x+5\right)-15$
$\lim_{x\to0}\left(\left(\sqrt{x+1}\right)\right)$
$\int\frac{1}{6x^3-7x^2-3x}dx$
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