$4\cos^2x-cosx=0$
$\lim_{x\to1}\left(1-x\right)^{log\:x}$
$k2\:+\:16k\:=\:-37$
$w^2+10w+10$
$\cos^42x-\sin^42x=\cos4x$
$\frac{\left(x^3+3x^2-2\right)}{x+1}$
$1.2-0.85$
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