$\frac{1}{2}a^2b^3\frac{12}{5}a^2b^3-\frac{16}{23}a^3b$
$\sqrt{-4+\sqrt{-121}}$
$\lim_{x\to1}\left(\frac{\sqrt[4]{5x+11}-2x}{\sqrt{5x+11}-4x}\right)$
$cosx+sinxtanx+secx$
$\left(y^{2}-x^{2}\right)dx+2xydy=0$
$-\frac{24}{6}+\left(\frac{3}{-3}\right)$
$k+2-3$
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