$2\cos\left(2x\right)=2\sin\left(2x\right)$
$3x+5^7$
$\left(k+6\right)\left(k-6\right)$
$\left(4x-2\right)\left(2x\right)$
$3x+2\ge6x-5$
$x\frac{\partial\:\:u}{\partial\:\:x}=y\frac{\partial\:\:u}{\partial\:\:y}$
$\sec^2-\cos^2$
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