Math, asked by bpvineeth2004, 7 months ago

1/cos^2A -1/cot^2A=?

Answers

Answered by wwwjyoti1590com

Answer:

How to proof the formula of cos 2A is equals 2 cos22 A - 1? (ii) In the above formula we should note that the angle on the R.H.S. is half of the angle on L.H.S. Therefore, cos 120° = cos22 60° - sin22 60°. (iii) The above formulae is also known as double angle formulae for cos 2A.

Step-by-step explanation:

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