$\lim_{x\to0}\left(\frac{2}{1-\cos\left(x\right)}\right)$
$\left(a^2b^4-7\right)\left(a^2b^4+8\right)$
$9x^2-24x=3$
$\left(-1\right)^n\frac{\left(x+3\right)^{n-1}}{n\left(3^n\right)}$
$-49a^{10}^n-\frac{h^{12x}}{81}$
$-\frac{2x^4y^3}{-x^2y^2}$
$5^x=n$
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