Asked by Matt
                The graph of y = cos x is concave down on which interval?
(-pi,0)???????
please help!!!!
            
        (-pi,0)???????
please help!!!!
Answers
                    Answered by
            bobpursley
            
    You ought to have this memorized.  From zero to Pi/2 it is concave down.  Or if you want to look negative, from -PI/2 to Pi/2
    
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