Posted by CJ on Thursday, January 13, 2011 at 4:33pm.
cos^-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
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