$\left(-42\right)-\left(-7\right)$
$\lim_{y\to0}\left(\frac{\left(x^2cos^2y\right)}{x^2+2y^2}\right)$
$16x^2+13xy-4x^2-xy$
$y^3-3y^3$
$9\cos\left(2x\right)$
$\left(a+4\right)\left(a+15\right)$
$\left(\frac{2}{3}x^{3m}-\frac{5}{4}x^{2m}\right)^2$
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