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

$-4\left(x^2-4x+4\right)$

$\int_{-2}^0\left(8x\right)dx$

$\int\:\frac{1+sen^2x}{sen^2x}dx$

$\lim_{x\to0.0001}\left(\frac{ln\left(x\right)}{\cot\left(x\right)}\right)$

$\cot\left(x\right)\cos\left(x\right)+\sin\left(x\right)=0$

$\int_0^l\left(\frac{11}{24}wlx-\frac{1}{2}wx^2\right)\left(-\frac{x}{l}\right)dx$