$9x^2-6xn+n^2$
$9\left(2a-4\right)=18$
$24\sin\left(x\right)\cos\left(x\right)=9\cos\left(x\right)$
$\int_0^{\infty}\cos xdx$
$\left(x+y-22\right)^2$
$-178+870$
$3y'\:+xy\:=\:x$
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