$\cos^2a\left(1+\cot^2a\right)$
$\lim_{x\to0}\left(\frac{\cos\left(x\right)sin\left(x\right)}{x^2}\right)$
$\frac{x^2+x+6}{x^2+5}$
$3x^4+x^2-2x+1=y$
$\int\cos^29xdx$
$\int4^{10x}dx$
$\int sec^7xtan^3xdx$
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