If π/4 ≤ α < β ≤ π , which one is correct?
A. cos α > cos β
B. cos α < sin β
C. sin α > sin β
D. cos α < cos β
E. sin α < sin β
I guessed B, cos α < sin β but it is not. cosinus in first quadrant after π/4 must be lower than sinus. And in second quadrant cosinus is negatif there for i thought the answer was ''b'' but its not. Can anybody explain to me, please if I am wrong?
A. cos α > cos β
B. cos α < sin β
C. sin α > sin β
D. cos α < cos β
E. sin α < sin β
I guessed B, cos α < sin β but it is not. cosinus in first quadrant after π/4 must be lower than sinus. And in second quadrant cosinus is negatif there for i thought the answer was ''b'' but its not. Can anybody explain to me, please if I am wrong?