$2x^2y+4x^3y^2$
$\left(1^2\cdot7\right)\cdot\left(8^2-8\right)\cdot1$
$21\frac{1}{4}x^2-2$
$4x^3+2x-10$
$3x+1\le7$
$81m^4-36m^2+4$
$\lim_{x\to\frac{\pi}{2}}\left(1+2\cos\left(x\right)\right)^{\frac{1}{cosx}}$
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