$x^2-yx^2+\frac{dx}{dy}\left(y^2+xy^2\right)$

$f\left(x\right)\:=\:\left(x\:-\:3\right)\:\left(x\:-\:4\right)\:$

$tan\:x=\frac{sen^2\left(x\right)}{\sin\left(2x\right)}$

$\left(5a-b^2\right)^2$

$\frac{4x^3+6x^2-10x+8}{x-4}$

$3\left(-1\right)^2-3\left(-1\right)-6$

$\frac{dy}{dy}=1+\tan\left(y-x\right)$