$\log_{12}3+\log_{12}48$
$\left(\tan\:+\cot\:\right)\left(\cos+\sin\right)=\cos+\sec$
$x+3y-2z+w=2$
$\frac{2x^4-5x^3+x^2-x}{x^2+1}$
$6\cdot2+3\left(-8\right)-7+\left(-3\right)$
$xy^'=e^x-y$
$3x^3+x+3+18-6x^3-8x+3x^3+7x-2x^2$
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