Asked by khushal305 | 29th Sep, 2009, 08:50: PM

Expert Answer:

We have not understood the query that you have posted. We would request you to clarify whether it is cos square or cos 2
cos2 θ  - sin2 θ = tan2 Φ , prove that cos Φ =             1              .

                                                                                    2 cos θ

  so that we may answer this to the best of the ability.

Answered by  | 25th Nov, 2009, 11:23: AM

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