$50z^2+220z+242$
$\left(2x^2y^4+6a^5b^3\right)\left(2x^2y^4-6a^5b^3\right)$
$x^2+25\le169$
$x^3-8x^2+11x+20$
$10mn\frac{7x}{3}-1$
$\frac{2}{\csc\left(2x\right)}$
$3x^2-9y^2$
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