I came across this in the calculus section: . How can it be proven?

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- May 2nd 2010, 10:49 PMPQRProving a trigonometric identity
I came across this in the calculus section: . How can it be proven?

- May 2nd 2010, 11:08 PMChris L T521
- May 2nd 2010, 11:19 PMAmer
- May 2nd 2010, 11:33 PMPQR
- May 2nd 2010, 11:35 PMChris L T521