$\int39cos^2\left(3x\right)dx$
$\frac{x^3-4x^2-3x+2}{x-2}$
$\sqrt{x^2+y^2}=sin\left(x\right)$
$\int\frac{2}{x^2+4x\:-5}dx$
$3cot^2z+7cotz+2$
$\lim_{x\to0}\left(1-9x\right)^{\frac{1}{x}}$
$1+\sin a\cdot1-\sin a=\frac{1}{\sec2a}$
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