$\frac{\cos\left(b\right)\cdot\tan^2\left(b\right)}{1+\cos\left(b\right)}$
$\int_0^mx\sqrt{x-m}dx$
$\left(2x-3y\right)\left(x+2xy-3y\right)$
$\left(x^2+3x-6\right)\cdot\left(-3x^3\right)$
$\frac{5x}{\left(1-3.9x\right)\left(1+0.39x\right)}$
$85^2$
$\lim_{x\to0}\frac{x-4}{\sqrt{x}-\sqrt{8-x}}$
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