$2y^2+7y+4y+6y^2$
$cos2a+6cos^2a=1$
$x^{2\:}-\:10x=\:-20$
$-12\cdot132$
$9x^2+24x+16$
$\int10\cos^2\left(3x\right)-5dx$
$4x+12\:and\:4\left(x+3\right)$
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