$\frac{x^2+8x^2+6x+1}{x+5}$
$\sqrt[4]{x^4}+y$
$4x^2\left(3x+1\right)^5$
$\frac{1-\cos\left(4x\right)}{x\sin\left(5x\right)}$
$\lim_{x\to0}\frac{sec\:9x-sec\:7x}{sec\:5x-sec\:3x}$
$\int cos\:2y\:\cot y\:dy$
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