$\cos^2x-\cos^4x$
$\frac{5a^3b^5}{15a^4b^3}$
$1+2\cot^2\left(x\right)+\cot^4\left(x\right)=\csc^4\left(x\right)$
$\left(\frac{-1}{6}\right)^{-3}$
$\frac{x-9}{x^2+4x}$
$\frac{-3^{-2}-6^{-1}}{6^2-\left(-3^{-1}\right)}$
$20x-7+10x+20$
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