$\int\frac{2x+3}{\sqrt{4-x^2}}dx$
$\left(2x+y-2z\right)^2$
$2\tan^2x-3=3$
$4x^2\:+\:\:28x\:+\:49$
$-x^3+6x^2-11x+6$
$6g-4g+10-3g-7$
$\int2sin9xcos4xdx$
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