SOLUTION: Prove the identity. (must work with left side) (1-2sin(x)^2)=(cos(x)^2)

Algebra ->  Algebra  -> Trigonometry-basics -> SOLUTION: Prove the identity. (must work with left side) (1-2sin(x)^2)=(cos(x)^2)       Log On

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 Algebra: Trigonometry Solvers Lessons Answers archive Quiz In Depth

 Question 155191This question is from textbook precalculus : Prove the identity. (must work with left side) (1-2sin(x)^2)=(cos(x)^2) This question is from textbook precalculus Answer by stanbon(57361)   (Show Source): You can put this solution on YOUR website!(1-2sin(x)^2)=(cos(x)^2) sin^2(x) + cos^2(x) - 2sin^2(x) = cos^2(x) cos^2(x) - sin^2(x) = cos^2(x) -sin^2(x) = 0 ---------------------- The original problem is NOT an identity. It leads to a statement that is true only for certain values of "x". ===================================================================== Cheers, Stan H.