$2x\:cos\:-\:4xcos$
$\int\frac{f^2}{f+4}df$
$\lim_{x\to0}\left(sinx^2-sin6\right)$
$2a^2+3a+2a^2-5$
$\frac{2}{3}x+\frac{1}{3}=\frac{1}{3}x$
$\frac{d}{dx}\frac{\sin2x-\cos2x}{\sin2x+\cos2x}+\cos3x$
$\sqrt{6+\sqrt{9}}$
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