$x+12=126$
$\log4\left(5\right)+\log4\left(x\right)=\log4\left(60\right)$
$3-8+12-15-1+10-4$
$\frac{1-cos\left(x\right)}{1+cos\left(x\right)}=cot^2\left(x\right)-2cot\left(x\right)csc\left(x\right)+csc^2\left(x\right)$
$3x^2+\:23x\:-\:8$
$\frac{d^2u}{dxdy}+bu=0$
$\left(-5\right)+0\left(-15\right)$
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