$r^2-30r+225$
$294r^2-150$
$\left(m^3+6\right)\left(m^2+4\right)$
$\left(3x^4-2x^3+3\right)\left(x+2\right)$
$\frac{\tan\left(x\right)\sin^2\left(x\right)+\tan\left(x\right)\cos^2\left(x\right)}{\sin\left(x\right)}$
$\left(-5\right)\:x\:10\:-\:10$
$\:y-1+20y^2$
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