$\cos\left(\pi+x\right)=-\sin\left(\pi-x\right)$
$\left(81a^2-4\right)$
$-25\:\cdot\:-17$
$1+e^{4\pi x}\frac{dy}{dx}=0$
$20+90+51w$
$\lim_{x\to1}\left(\frac{x^3-1}{x^5-x^2}\right)$
$\frac{x^2-\frac{1}{4}x-3}{x+2}$
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