$7ayz^3-21yz^3-9ay+24ayz^3-6ay+4yz^3$
$x^2-4x+1=\:0$
$4cos^2\left(x\right)-4cos\left(x\right)+1=0$
$\int15x^2e^xdx$
$\log a+3log2b$
$m^2+50+625$
$y'\:=\:\frac{2}{3}x\sqrt{1-9y^2}$
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