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Question: How do I display the numeric value for a trig function such as cos(pi/4)

Question:How do I display the numeric value for a trig function such as cos(pi/4)

Wtolrud 75 Maple
July 24 2017
2

when I enter a trig function as cos(pi/2) I get as a return the same input.  What I would like is the numeric answer displayed. also there are times when I don't want pi in the answer but a numeric value calculated based on pi * whatever.

Thanks

Bill
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