$\frac{\left(\left(3^2\right)^3-3^{-4}\right)}{\left(9^{-2}\right)}$

$\int_0^{\infty}\left(\frac{e^{\sqrt{x}}}{\sqrt{x}}\right)dx$

$3\ge\frac{x-3}{x+4}$

$\int\sqrt{4-\left(x-6\right)^2}dx$

$\left(-4+8-13\right)+\left(-5+17-4+31\right)$

$\left(6x^2y^5z\right)\left(-8x^2y^4\right)$

$\tan\left(a\right)=\sin\left(a\right)^2\sec\left(a\right)^2$