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Pre-Cal

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1) Verify the identity

cos^2 B - sin^2 B = 2 cos^2 B -1

I know that cos^2 B - sin^2 B = 2 cos^2 B -1 by the double angle formula but I do not know how to show this.

  • Pre-Cal - ,

    LS =
    cos^2 B - sin^2 B
    = cos^2 B - (1 - cos^2 B)
    = 2cos^2 B - 1
    = RS

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