$\frac{x^{4n}-1}{x^{2n}-1}$
$0a^3\:-\:2a^3$
$8\cos\left(x\right)^2+2=\cos\left(2x\right)$
$-18ab+16n-6ab+5-3n+2$
$\frac{d}{dx}x^3-2xy+y^3=11$
$\lim_{x\to5}\left(\frac{sin\left(\pi x\right)}{x^2-10x+25}\right)$
$7a-6a+9+7a$
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