$\cot x=\tan\left(\frac{\pi}{2}-x\right)$
$x\:+\:2\:\le\:6$
$\frac{d}{dx}\left(\ln\left(\cos\left(2y\right)\right)+ye^{3x-6}+x^2=4\right)$
$x^2+26x+0$
$y'+\frac{1}{t}y=7cos\left(5t\right)$
$4x-6=30$
$2x-3x-2$
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