Cos2A=cos^2 A - sin^2 A

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Prove Cos2A=Cos^2A-Sin^2A 0:03:13

Prove Cos2A=Cos^2A-Sin^2A

COS 2A = 0:06:41

COS 2A = COS^2 A - SIN^2 A = 1- 2 SIN^2 A = 2COS^2 A -1 = (1 - TAN^2 A) / (1+TAN^2 A) | TRIGONOMETRY

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#COS(A+B).COS(A-B)=COS²A-SIN²B (or)COS²B-SIN²A