$20ax^2-8ay^2-5bx^2+2by^2$
$\left(x+y-2\right)^3$
$\left(5x^{12}y^7\right)^3$
$9\tan^2\left(x\right)+16$
$x^2-1+\left(2x+3\right)$
$\lim_{x\to\infty}\left(ln\left(x\right)\right)^{\frac{14}{x}}$
$\left(-2\right)^2-\left(-2\right)\cdot3+2\cdot\left(3\right)^2$
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