$\frac{1}{2}\left(3-\cos\left(2a\right)\right)$
$x^2-\left(25-x\right)^2=25$
$\int\frac{6x+11}{\sqrt{x^2-6x+10}}dx$
$x^2-y^2=588$
$3x^6-6x^4-12x^3$
$3a-5b+8a-b-a-2b+5b+6a$
$\lim_{x\to0}\left(\frac{sinx+3xcosx}{x}\right)$
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