$\frac{\left(-18\right)}{\left(6\right)}+\left(-4\right)$
$\int_{\frac{\pi}{4}}^{\frac{\pi}{2}}-6xcsc^2x\:dx$
$-4-\left(-9\right)$
$-81\cdot5$
$12mn^3+7mn+10-3mn^3-6$
$\int\frac{1}{4}y\cos\left(y^2\right)dy$
$\frac{-8x^3}{\:x+3}$
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