$25x^2-20+4$
$\lim_{x\to2}\left(\frac{2-\sqrt{5x-1}}{x-2}\right)$
$\sqrt{3^2+2^2}$
$\lim_{x\to0}\left(\frac{-2\left(5+x\right)^2+50}{x}\right)$
$\frac{675}{225}$
$\int\frac{\left(cos^{-1}\left(x\right)\right)^{-3}}{\sqrt{1-x^2}}\:dx$
$\frac{\left(cos\left(x\right)\right)}{\left(1+cos\left(2x\right)\right)}=\frac{\left(sin\left(x\right)\right)}{sin\left(2x\right)}$
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