$10x^2-5x+15x^3$
$\frac{dy}{dx}\left(y=x^{4x}\right)$
$\left(5x^2+\frac{2}{5}y\right)\left(5x^2-\frac{2}{5}y\right)$
$\left(2x+7\right)\left(5x+10\right)$
$-8x-30=-12x-58$
$\left(-20+8\right)\::\:\left(\:-8+4\right)$
$\lim_{x\to0}\left(\cos\left(\frac{x}{2}\right)\right)$
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