$\int x^2cos\left(4x\right)dx$
$\int2000\left(1+0.2x\right)dx$
$\left(\frac{x}{y}+\frac{2}{3x}\right)+\left(\frac{2}{3y}-\frac{1}{xy}\right)\frac{dy}{dx}=0$
$6cos\left(3x\right)=4$
$\frac{60+80}{2}$
$\lim_{x\to-1}\left(\frac{x^2-9x+8}{x^2+x}\right)$
$\cos\left(x-\pi\right)=\cos\left(x\right)$
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