$x^{-4}y\int\left(xe^x\right)dx$

$\:\int\frac{1}{x\sqrt{9x^4-25}}dx$

$\frac{\left(2sec\left(t\right)\right)}{\left(5\left(tan\left(t\right)sin\left(t\right)+cos\left(t\right)\right)\right)}$

$4x^4y^2-4xyz^3+144$

$\frac{5v+1}{v^2+2}+\frac{1}{7}+\frac{b^3+7a}{a}$

$\left(x^2-y^8\right)^2$