$9x^2+18\:xy$

$\int\frac{sin\left(t\right)}{t}dt$

$4-\left(-4\right)+17+\left(-3\right)-20$

$\int\left(\frac{\left(3\right)}{\left(3m-7\right)^5}\right)dx$

$2x+7x-x-8x$

$\frac{d}{dx}arctan\left(8x\right)$

$\left(a\right)^2.\left(-b\right)^3.\left(c\right).\left(a\right)^4\left(-b\right)^6.\left(c\right)^3$