Asked by math
                Find the EXACT value of cos(2A)
if angle A is arctan(12/5).
cos(2A)=
            
        if angle A is arctan(12/5).
cos(2A)=
Answers
                    Answered by
            oobleck
            
    okay - I've done some
How about you review your formulas and show your work ? ...
    
How about you review your formulas and show your work ? ...
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