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posted by john 2020 Monday, March 8, 2010 at 10:40pm.
find the exact value: cos^-1 (square root of 2 divided by 2)
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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