$\frac{d}{dx}\left(\frac{\sin\:\left(x\right)-x}{x^3}\right)$
$x^{2}+3xy+2y^{2}+4x+7+3$
$81\cdot2$
$\lim_{x\to1}\left(2x^2+x\right)$
$\int\cos\left(2\right)^2\sin\left(2x\right)dx$
$-x^2-10x-22\ge0$
$\left(xy+3\right)\left(xy+3\right)$
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