$2-8\cos^2=0$
$-3y+7y+4y^3-2y^2+6y^3-7y^3-5y$
$14ab+ab+8a^2-2a^2+2ab$
$5x^3-x$
$\frac{dy}{dx}=\frac{6x}{\cos y}$
$\lim_{x\to-3}\left(\frac{\left(x^5+243\right)}{2x^2+11x+15}\right)$
$-2\cdot0+2$
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