$\left(9x-7\right).\left(4x^2+2\right)$
$\frac{9}{4}+\frac{30}{8}$
$6\cos^2x+7cosx+2$
$\left(y^2-3\right)^3$
$-14+\left|-28\right|$
$\left(10a^2+6\right)^2$
$t\frac{dy}{dt}+y=2t$
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