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simplify: using the double angle foruma i got to this part:

Quote: Originally Posted by viet simplify: using the double angle foruma i got to this part: Let (See diagram below) Then Can you find the value of from the diagram below? ......Of course you can! The problem is child's play from here. (You didn't have to use a triangle, you could have used the Pythagorean Identities for sine and cosine)