SOLUTION: prove 2/(1+cos 2 t)= sec^2t

Question 998935: prove 2/(1+cos 2 t)= sec^2t
Answer by josgarithmetic(39623) (Show Source): You can put this solution on YOUR website!
Find, or derive, the double angle cosine formulas, and pick the one which uses only . This is the one: .

LeftHandSide

and according to definition

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