$\int\frac{3+7.\cos^2x}{1+cos\:2x}dx$
$\lim_{x\to0}\left(\frac{x^8-1}{x^{30}-1}\right)$
$\frac{\left(-x^3+4x\right)}{x-3}$
$3\left(5x-4\right)^2$
$\int8^{-5}dx$
$f\left(x\right)=sin\left(x\right)cos\left(x\right)$
$2.57+0.88$
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