$\tan^2\left(x\right)+4\tan\left(x\right)=21$
$8x^2+7x-6$
$\left(3x+5y-z-2w\right)^2$
$\left(-2x-x\right)$
$\int2\left(x^2-3\right)^9xdx$
$-13+7+2-8+4-6$
$2x\sqrt{x^2}-10$
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