$\left(3a^2-7xy^4\right)^3$

$\left(x^2+3x\right)+\left(x^4+6x^2\right)+\left(-x^3-2\right)$

$2x=5x+18$

$\int_{-8}^{\infty}\left(2\cdot\sin\left(x\right)\right)dx$

$\lim_{x\to\infty}\left(\frac{3-x^2}{3+x^2}\right)$

$4z^2+3z-6z$

$\frac{d}{dt}\left(\sqrt{\frac{t}{4t+1}}\right)$