SOLUTION: Evaluate cos(2sin^-1(4/5))
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Question 365266: Evaluate cos(2sin^-1(4/5))
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Let A = 2sin^1(4/5). Then A/2 = sin^1(4/5), or . We have to find cosA. But from the identity we get
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