Evaluate
-\frac{\sqrt{2}}{2}\approx -0.707106781
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\frac{-6}{6\sqrt{2}}
Multiply 2 and 3 to get 6.
\frac{-6\sqrt{2}}{6\left(\sqrt{2}\right)^{2}}
Rationalize the denominator of \frac{-6}{6\sqrt{2}} by multiplying numerator and denominator by \sqrt{2}.
\frac{-6\sqrt{2}}{6\times 2}
The square of \sqrt{2} is 2.
\frac{-\sqrt{2}}{2}
Cancel out 6 in both numerator and denominator.
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