$\frac{36m^{2}-49n^{2}x^{4}}{6m-7nx^{2}}$
$9-\left(-4\right)$
$6a^2\sqrt{a}+4\sqrt{6a}$
$\int\left(8\cos\left(4x\right)\right)dx$
$3\tan\left(2x\right)=\sqrt{3}$
$8p+10q-20r-18p+23q+15r$
$x+3+3x^2-3x+6$
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