$x+1x-2$
$50xy^2-4x^2$
$\left(x+4\right)^2+\left(y-5\right)^2-4=0$
$\left(b^3-2a^2b^2\right)^4$
$\left(p^2q^2\right)^2$
$2x^2-5x-6;\:x=4$
$\cos^2\left(x\right)+3\sin^2\left(x\right)=2$
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