calculus

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prove
cos squared B- sin squared B= 2cos squared B -1

  • calculus -

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

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

  • calculus -

    substitute 1 - cos^2B for sin^2 B

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