$-70\cdot10-5-22-83$

$\int\frac{x^2}{\left(x^2+4\right)^4}dx$

$\lim_{x\to\pi}\sin\left(5x\right)\csc\left(4x\right)$

$\left(\frac{24x^9y^4}{36x^8y^{10}}\right)^4$

$\int x\left(2x+3\right)^7dx$

$\lim_{t\to0}\left(\frac{\left(e^{8t}-1\right)}{2t}\right)$

$\frac{1}{5}\left(3y-1\right)-\left(y+3\right)$