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January 29, 2015

January 29, 2015

Posted by **john 2020** on Monday, March 8, 2010 at 10:40pm.

cos^-1 (square root of 2 divided by 2)

- precalculus -
**Damon**, Monday, March 8, 2010 at 10:53pmdraw 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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