$\int\left(\frac{2}{\sqrt{1-y^2}}\right)dy$
$\left(-y^2+2y+4\right)^2$
$4\left(2x^2+4x\right)+x^2$
$-x^3+2x^2+5x-6$
$6\cos^2y+3\cos y=0$
$x^4+12x^2\:+4$
$4x+2=5x-1$
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