$\frac{2\cos2x}{\sin2x}=\cot x-\tan x$
$2\cos^2x-3\cos x+1=0$
$\int\frac{x+1}{x^3+3x^2+3x}dx$
$\int4s\sqrt{s-5}ds$
$4x-y^1=6$
$\frac{2}{x}\le1$
$9n^2+c^2-6nc$
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