If cosA = x + 1/x , show that

Asked by  | 30th Jul, 2012, 03:35: PM

Expert Answer:

Please check your question. Cos A should be given to be equal to 1/2 (x + 1/x)
 
 
Similarly, you can find cos3A.

Answered by  | 30th Jul, 2012, 03:45: PM

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