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If cosA = x + 1/x , show that

Asked by 30th July 2012, 3:35 PM
Answered by 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 Expert 30th July 2012, 3:45 PM
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