HussanAli Messages 14 Reaction score 0 Thread starter Sep 23, 2009 #1 Identifying the signs of ratio in four quadrants. It turns out that -ive trignometric identity will be negative but not for cos and sec. But why?
Identifying the signs of ratio in four quadrants. It turns out that -ive trignometric identity will be negative but not for cos and sec. But why?
rock.freak667 Homework Helper Messages 6,221 Reaction score 31 Sep 23, 2009 #2 if you mean why cos(-x)=cos(x) is because if you draw x clockwise,it lies in the 4th quadrant and where is cos(x) +ve?
if you mean why cos(-x)=cos(x) is because if you draw x clockwise,it lies in the 4th quadrant and where is cos(x) +ve?