Homework Help: math

Posted by Anonymous on Saturday, April 14, 2012 at 11:55pm.

Determine exact value of cos(cos^-1(19 pi)).

is this the cos (a+b)= cos a cos b- sina sin b? or is it something different. When plugging it in the calculator, do we enter it with cos and then the (cos^-1(19 pi)).

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