SOLUTION: 24. find the exact values for sin2u cos2u tan2u cosu=-2/3

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Question 174477: 24. find the exact values for sin2u cos2u tan2u
cosu=-2/3
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
sin2u%2A+cos2u%2A+tan2u
sin2u%2A+cos2u%2A+%28%28sin2u%29%2F%28cos2u%29%29
%28sin+2u%29%5E2+
%282sinu%2Acosu%29%5E2+
4+%28sin+u%29%5E2+%2A+%28cos+u%29%5E2, where %28cos+u%29%5E2=4%2F9 and %28sin+u%29%5E2+=+1-%28cos+u%29%5E2+=+5%2F9+

Now, 4+%28sin+u%29%5E2+%2A+%28cos+u%29%5E2,
4%2A%285%2F9%29%2A%284%2F9%29+
80%2F81

R^2