$\cos\left(x\right)\left(\sin\left(x\right)+\cos\left(x\right)\cot\left(x\right)\right)$
$\int_0^{\sqrt{4-y^2}}\left(\frac{2}{\sqrt{4-y^2}}\right)dx$
$35x^2-8x-15$
$\lim_{x\to0}\left(\frac{2tan\left(x\right)-arcsin\left(x\right)}{sin\left(x\right)}\right)$
$2a^2\left(m+2n\right)\left(2x-y\right)$
$\frac{4y^2+6y+7}{2y-4}$
$\frac{13^2}{13^2}$
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