$\left(5\sqrt{a+2}\right)\left(2\sqrt{a-3}\right)$

$2x^5+2x^4-16x^3-24x^2$

$3\:x\:>\:12$

$\left(-3\right)^1\:\:$

$-\sin\left(x\right)\sec\left(x\right)-\cos\left(x\right)\csc\left(x\right)=-\sec\left(x\right)\csc\left(x\right)$

$\left(x^2+2\right)y'-2xy=3\left(x^2+2\right)^2$

$8+-2\cdot4$