$\frac{dy}{dx}=y+y^3$
$-4\left(x-y\right)-4\left(y-5x\right)$
$\left(4d+5\right)\left(4d-5\right)$
$-8\left(r+4\right)+7\left(r+2\right)$
$\left(sin\:2a\:+\:cos\:2a\right)^2\:-\:1\:=\:sin4a$
$\left(\cos x\right)\left(\csc x-\sec x\right)=\cot x-1$
$\left(x^8-2\right)\left(a^8+2\right)$
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