$-\cot\left(\frac{5\pi}{6}\right)+\cot\left(\frac{\pi}{6}\right)$
$4\left(2x\:+\:5\right)\:=\:8x\:+\:30$
$\ln\left(y^2\right)=.5x\ln\left(x-1\right)$
$a^2-36a+49$
$2a+3b-5ab.5a-4b+2ab$
$\frac{750}{150}$
$-12\cdot\left(-34\right)$
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