$\int\frac{\sin\left(x\right)}{\cos^5\left(x\right)}dx$

$\lim_{x\to-\infty}\left(\frac{6x^2-2}{4x^2+e^{-x}}\right)$

$n-2n$

$\frac{d}{dx}\left(\frac{1}{3}x\right)$

$\frac{\sin\left(x\right)\cos\left(x\right)}{\tan\left(x\right)}=1-\sin\left(x\right)$

$-\left(-4\right)$

$3x\left(3x-3\right)$