$\left(1-\cos b\right)^2+2\cot b\sin b$
$y+y+2=18$
$316.09\cdot100$
$n^6-125a^6$
$\lim_{x\to\pi}\left(x-\pi\right)^2\cos\left(\frac{1}{x-\pi}\right)$
$\cos^2x-2\cos x+1$
$x^2+20x-17$
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