$\frac{\cos^2\left(x\right)}{1-\cos^2\left(x\right)}+2\csc^2\left(x\right)=\cot^2\left(x\right)$

$\frac{s^2-2s+3}{\left(s-1\right)^2\left(s+1\right)}$

$-0.6+\frac{1}{4}$

$\frac{\sin\:\left(x\right)+\cos\:\left(x\right)}{\sin\left(x\right)\cos\left(x\right)}$

$\frac{1}{1-\sin\left(x\right)}=\frac{1+\sin\left(x\right)}{\sin^2x}$

$27x^{3-8}$

$\frac{dy}{dx}\left(\frac{x}{8-3x}\right)$