$18-4\:x\:3\:-2$

$\int\sqrt{121-t^2}dt$

$65x+88x^2-19x+69x^2$

$\int\left(8x\left(x^2+7\right)^5\right)dx$

$\left(8x^3-1\right)\left(2x-1\right)$

$\int\left(7x^3-15x^2+6x\right)e^{4x}dx$

$\left(cos\left(x\right)\right)\left(tan\left(x\right)+cos\left(x\right)sin\left(x\right)\right)$