Evaluate
\frac{1}{2}=0.5
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2\cos(60)\cos(60)
Multiply 30 and 2 to get 60.
2\times \frac{1}{2}\cos(60)
Get the value of \cos(60) from trigonometric values table.
\cos(60)
Multiply 2 and \frac{1}{2} to get 1.
\frac{1}{2}
Get the value of \cos(60) from trigonometric values table.
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