If A is a positive acute angle and sin A = (square root) 5/3, what is cos 2A ?

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- May 21st 2009, 06:21 PMFenix FlaustFinding cos(2A) given sin(A)
If A is a positive acute angle and sin A = (square root) 5/3, what is cos 2A ?

- May 29th 2009, 05:31 AMmr fantastic