Asked by Cherry
                How do i find the exact value for 
(Cos 5pi/16)(Cos pi/16) + (sin 5pi/16)(sin pi/16)
            
        (Cos 5pi/16)(Cos pi/16) + (sin 5pi/16)(sin pi/16)
Answers
                    Answered by
            Steve
            
    well, cos(A-B) = cosAcosB + sinAsinB
    
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