$\left(2+x\right)\left(y\right)^'=3y$
$3x+4<-4$
$3a^3-3a^2+9a^2-a^2+ab-3b^2$
$3cos^2x$
$\int\left(2x+1\right)^2\ln^2\left(2x+1\right)dx$
$\cos\left(\theta\right)\sin\left(\theta\:\right)\left(\sec\left(\theta\:\right)+\csc\left(\theta\:\right)\right)$
$16-36n^2$
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