$\sin^2a\left(\csc^2\left(a\right)+\sec^2\left(a\right)\right)=\sec^2\left(a\right)$
$2xy^2+10x^2y$
$\left(x\:+9\right)\:\left(3x\:+1\right)\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$15,3x^3y^5\cdot15,3x^3y^5$
$\frac{k}{4}\:+\:-76\:=\:-51$
$\frac{d}{dx}\left(x\right)^3-3x^2+3x$
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