$\left(-x^2-4\right)\left(-x^2+1\right)$
$15^6$
$\left(7-m^2\right)\cdot\left(7+m^2\right)$
$\int\frac{e^{3x}}{9+e^{2x}}dx$
$2sin^2x=sinx+3$
$7\left(x+5\right)<-3\left(x-13\right)+1$
$7b^2-7m$
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