$2x\left(\tan\:^2\left(2x\right)+3\right)+3\:$
$x^2\left(x+2\right)^4$
$\int\frac{z}{z^3-z^2-6z}dz$
$30\cdot30$
$x3+3x+4x+7x$
$f\left(x\right)=4\sqrt{5x^4}+6x^3+x^2$
$x+2y+7x-9x-3y-12xy$
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