$\cos\left(x\right)=\cos^2\left(x\right)-\sin^2\left(x\right)$
$\frac{dy}{dx}=0.3-y$
$w^2\:+\:w\:-\:56$
$4y^3\:=\:2y^9$
$\lim_{x\to0}a^x+b^x$
$m^2-8m+15$
$b^6-3b^3+8b^4-4b^2$
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