$cos2x=cos2x+-sen2x$
$k^{2}-225$
$6a^4+24+10a^2$
$2\left(12^a+8b\right)$
$0=18x^5$
$\left(4h^3\right)^2\:\left(-1g^3h\right)^3$
$\int\left(\left(x^2-4x\right)e^{1-3x}\right)dx$
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