$10-\left|8-\left(4-7\right)+\left(-5-11\right)+2\right|-\left(3-9\right)$

$\frac{3\:sen\left(x\right)+\:4\:cos\left(x\right)}{sen\left(x\right)\:cos\left(x\right)}=3\:sec\left(x\right)\:+4\:csc\left(x\right)$

$38\left(-2\right)$

$\frac{15\sqrt{6}}{3\sqrt{5}}$

$-2+2x-1$

$2z^2-2z=1$

$\frac{dy}{dx}=\frac{x}{y\left(1+x^2\right)}$