Tue September 29, 2009 By: Khushal Gupta


Expert Reply
Wed November 25, 2009

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.

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