$\int_0^{2\pi}\left(\frac{1}{\left(2+cos\left(a\right)\right)}\right)da$

$f\left(x\right)=\frac{x\left(x^2-2\right)^2}{x-7}$

$\lim_{x\to9}\left(-\frac{\left|x-2\right|}{x-2}3\right)$

$\lim_{y\to0}\left(ln\left(y-x\right)-ny\left(ln\left(x\right)\right)\right)$

$-x=-13$

$\tan\left(b\right)+\cot\left(b\right)=\csc\left(b\right)\cdot\sec b$

$\frac{d}{dx}4x^3e^x$