SOLUTION: Find the exact value of the expression
cos(sin^-1(square root of 5/5))
Algebra.Com
Question 635467: Find the exact value of the expression
cos(sin^-1(square root of 5/5))
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
We want to find 
if 
where 
So
Substituting back:
\ =\ \pm\frac{2\sqrt{5}}{5})
John
My calculator said it, I believe it, that settles it
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