$\:4x\:+\:5x\:+\:2x\:+\:x$

$\int\frac{\left(6x^2+3x+4\right)}{x^3+2x}dx$

$\int\left(x+2\right)^2\left(3-x\right)^7dx$

$sin\left(x\right)+x+sin\left(2x\right)+x$

$\left(x+2\sqrt{xy}+y\right)\left(x-2\sqrt{xy}+y\right)$

$\int\frac{cosx}{4sin^2\left(x\right)+5sin\left(x\right)+4}dx$

$1-2x-x^2=0$