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cosx = ½ (x + 1/x ) then ½ x 2 + 1/x 2 =

cosx = ½ (x + 1/x ) then ½ x+ 1/x=

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1 Answers

Sourabh Singh IIT Patna
askIITians Faculty 2104 Points
7 years ago
Hii



apply whole square on both sides of

cosx = ½ (x + 1/x )



you will get what is asked on the right hand side .








Thanks

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