$-12+\left(49\right)-\left(-120-\left(-21\right)\cdot7\right)$
$\frac{\tan\left(a\right)}{\cot\left(a\right)}=\tan\left(a\right)^2$
$\frac{\ln\left(0.87\right)}{-0.00012}$
$20\cdot289$
$6x-3<12$
$32 + x = - 83$
$\frac{dy}{dx}2cos\left(5x\right)$
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