$\frac{\csc^3\left(x\right)\cos^2\left(x\right)}{\cot^3\left(x\right)}$

$\frac{1}{\tan^2\left(x\right)}-\frac{\csc\left(x\right)}{\sin\left(x\right)}$

$sen4x+sen2x=0$

$5x^3\cdot\left(2x^4-x^3+7x^2-3x\right)$

$\lim_{x\to0}\left(\frac{\frac{cos}{x}-\frac{sin\left(x\right)}{x^2}}{cos\left(x\right)}\right)$

$fcactor\left(x^3-3^2+3x-1\right)$

$\int\frac{2x^4-5\sqrt[5]{x}}{4x}dx$