$30-\left(50-60\right)+10$

$\frac{3\sin\left(x\right)+5\tan\left(x\right)}{\tan\left(x\right)}$

$\int\frac{2x^2+5x-7}{\left(x+2\right)^2}dx$

$\frac{1-\tan\left(x\right)^4}{\left(1-\tan\left(x\right)^2\right)\csc\left(x\right)^2}=\tan\left(x\right)^2$

$\sqrt{6x-3-1}$

$8m^3+n^3$

$-12\left(15-18\right)$