SOLUTION: find the exact value: sin (theta) = 4/5 lies in quadrant 1 , find cos 2(theta)

SOLUTION: find the exact value: sin (theta) = 4/5 lies in quadrant 1 , find cos 2(theta)

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Question 613275: find the exact value:
sin (theta) = 4/5 lies in quadrant 1 , find cos 2(theta)
Answer by jsmallt9(3758) (Show Source): You can put this solution on YOUR website!
There are three variations of the formula:

Any of these can be used. But since we only know at the moment, it makes sense to use the third one:

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