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

$\int_{-3}^{-1}\frac{\left(2x-1\right)\left(3-4x\right)}{3x}dx$

$\int x^2\left(x-\frac{2}{t}\right)dx$

$4b^2-20bc^2+25c^4$

$\frac{sinx}{1+cosx}+cscx+cotx$

$\left(5x^5+y-m^3\right)^3$

$\frac{25+36x^4}{5+6x^2}$