Why do cosine and secant have the same sign in all quadrants?

[HussanAli]

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]

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?