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\frac{1}{2}\cos(30)
Get the value of \sin(30) from trigonometric values table.
\frac{1}{2}\times \frac{\sqrt{3}}{2}
Get the value of \cos(30) from trigonometric values table.
\frac{\sqrt{3}}{2\times 2}
Multiply \frac{1}{2} times \frac{\sqrt{3}}{2} by multiplying numerator times numerator and denominator times denominator.
\frac{\sqrt{3}}{4}
Multiply 2 and 2 to get 4.