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72\times \frac{1}{2}\cos(60)
Multiply 8 and 9 to get 72.
36\cos(60)
Multiply 72 and \frac{1}{2} to get 36.
36\times \frac{1}{2}
Get the value of \cos(60) from trigonometric values table.
18
Multiply 36 and \frac{1}{2} to get 18.