Evaluate
-1
Factor
-1
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f\times \frac{\pi }{2}\times 0-\sin(\frac{\pi }{2})
Get the value of \cos(\frac{\pi }{2}) from trigonometric values table.
0-\sin(\frac{\pi }{2})
Anything times zero gives zero.
0-1
Get the value of \sin(\frac{\pi }{2}) from trigonometric values table.
-1
Subtract 1 from 0 to get -1.
\frac{f\pi \cos(\frac{\pi }{2})-2\sin(\frac{\pi }{2})}{2}
Factor out \frac{1}{2}.
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