$\frac{sen\:\left(x\right)\:tan\left(x\right)}{csc\:\left(x\right)\:-cot\:\left(x\right)}-sen\:\left(x\right)=\tan\left(x\right)$

$x=2\left(x^4-9x^2+4x\right)$

$\frac{3x^3-2x^2-7x-2}{x+2}$

$4x^2-32xy^3+64y^6$

$4\cdot\left(-3\right)+11\cdot\left(-1\right)^5$

$5m\:-\:3n\:-0,25\:=\:0$

$4\left(3+5\right)-\left(-5-6\right)+3\left(-4\right)$