$\left(2x+18\right)\:<2$
$\cos\:\left(\frac{\pi\:}{4}-x\right)=\frac{1}{2}$
$\frac{d}{dx}5e^{-7x^3-9x^9}$
$91y^2-16x^22^2$
$x\left(a+b\right)$
$1.x^2=5x-6$
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