$\int\:\frac{3x+3}{2x^2+4x}dx$
$4x^2-7a^2+5x^2+a^2$
$y'+3xe^y=0$
$4cos\:\left(x+\pi\right)$
$\cos a=\left(-05\right)$
$\lim_{x\to\infty}\left(1+2x^{\frac{1}{x}}\right)$
$36-9y+81y^2$
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