$\frac{\left(x^2y^4\right)^2}{xy^2}$
$\left(1+3y\right)^3$
$\frac{-9x^{-1}y^{-9}}{-15x^{5}y^{-3}}$
$3\:\left(3m^3\right)\left(-2b\right)^2$
$2\cos\left(x\right)^2=2-\cos\left(2x\right)$
$x^2-80x+25$
$6x^2-20x+12$
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