Math, asked by yerramilli1968, 9 months ago

cos²20° + cos²40° + cos²80° =

Answers

Answered by pokuruvam147

4

Answer:

cos²2o +cos²40 + cos²80=

1+cos40/2 +1+cos80/2 +1+cos160/2

3+cos40+cos80+cos160/2.

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