Evaluate
108n_{30}
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\frac{54n_{30}}{\frac{1}{2}}
Get the value of \cos(60) from trigonometric values table.
54n_{30}\times 2
Divide 54n_{30} by \frac{1}{2} by multiplying 54n_{30} by the reciprocal of \frac{1}{2}.
108n_{30}
Multiply 54 and 2 to get 108.
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