$-\frac{3a^{-4}b^5}{15a^3b^3}$

$\int_0^{2\pi}\left(\left(1+3\sin\left(x\right)\right)\cdot sin\left(x\right)\right)dx$

$\int x\sqrt{9-x^4}dx$

$cos2x=2+\frac{4}{\csc\left(x\right)}$

$\frac{\left(-12x^3+28x^2-7x-12\right)}{-2x-1}$

$2u^2+7u+19=\left(u-1\right)^2$

$x+8\ge-5$