SOLUTION: evaluate without a calculator, give answer in exact value. sin(2 cos-1 4/5)

SOLUTION: evaluate without a calculator, give answer in exact value. sin(2 cos-1 4/5)

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Question 250830: evaluate without a calculator, give answer in exact value.
sin(2 cos-1 4/5)
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
There is no cosine of 1 4/5. Not in real numbers, anyway.
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