$28^2+45^2$
$\lim_{x\to0}\left(\frac{x^3}{x-tanx}\right)$
$\lim_{x\to0}\left(\frac{\cos\left(x\right)-1+\frac{1}{2}x^2}{8x^4}\right)$
$\left(\frac{x^3}{2}-\frac{2y}{3}\right)\left(\frac{x^3}{2}+\frac{2y}{3}\right)$
$-\left(-36\right)+\left(4\right)-10+100$
$17-\left(27\right)^2$
$x^2+y^2-1=0$
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