$3x^2+10x-48$

$5.30\cdot10$

$\left(-15x^4y^3\right)\left(-16x^2y^2\right)$

$\lim_{x\to-2}\left(8-x^3\right)$

$\frac{\cos\left(x\right)^2}{\sin\left(x\right)}+\left(\frac{-\cos\left(x\right)\cos\left(x\right)}{1+\tan\left(x\right)\cos\left(x\right)}\right)$

$2-csc^2x=1-cot^2x$

$\frac{3}{4}+\frac{5}{4}$