$6x=4x^2-1$
$\sec-\tan\sec+\tan=1$
$8n+12$
$\frac{36+12y+y^2}{2}$
$2b^2+12b-24$
$\cos\left(\frac{4\pi}{9}\right)cos\left(\frac{\pi}{9}\right)+\sin\left(\frac{4\pi}{9}\right)sin\left(\frac{\pi}{9}\right)$
$4b\:2\:x\:4b\:2\:$
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