Evaluate
\frac{1-\sqrt{3}}{2}\approx -0.366025404
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\frac{1}{2}-\cos(30)
Get the value of \sin(30) from trigonometric values table.
\frac{1}{2}-\frac{\sqrt{3}}{2}
Get the value of \cos(30) from trigonometric values table.
\frac{1+\sqrt{3}}{2}
Since \frac{1}{2} and \frac{\sqrt{3}}{2} have the same denominator, add them by adding their numerators.
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