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find the exact value:
cos^-1 (square root of 2 divided by 2)

  • precalculus -

    draw a 45 45 90 triangle with equal legs = 1
    hypotenuse^2 = 1^2+1^2
    h^2 = 2
    h = sqrt 2
    then cos 45 = 1/sqrt2 = sqrt 2/2

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