$21\cdot28$
$\lim_{x\to\pi}\arcsin\left(x\right)$
$\lim_{x\to1}\left(\frac{5x+3}{x-1}\right)$
$\frac{y^{\frac{1}{3}}y^{\frac{-2}{3}}}{x^{\frac{2}{3}}x^{\frac{-1}{3}}}$
$\left(2b-3\right)^2$
$5x^8-7x^4+2x^{11}-13x^9$
$\pi\left(-x^2+4x\right)^2$
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