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May 24, 2016
Posted by **CJ** on Thursday, January 13, 2011 at 4:33pm.

- Trigonometry/ Please Help -
**Reiny**, Thursday, January 13, 2011 at 5:01pmcos^-1 (√5/6)

is an angle Ų so that sinŲ = √5/6

sketch a right-angled triangle with hypotenuse 6, and opposite side √5

by Pythagoras the adjacent side is √31

then cosŲ = √31/6

so sin(cosˉ¹√5/6) = √31/6