this interval indicate to which quarter
This is just a Pythagorean right triangle in the 4th quad where x = 5, y = -12, and the hypoteneuse (r) = 13.
And the cosine is given by....
x/r = 5/13 = Answer (c)
sorry .. but how do you know that it is in the 4th quad !
and why you put y=-12 !!
It's in the 4th quadrant because the angle "x" lies between -pi/2 and 0.....
And remember that in the 4th quadrant, x is positive and y is negative. And the tanx = y/x = -12/5
Does that make sense, xvxvxv ???
I think that I forgot this information
if I not mistaken I think that there is a circle that illustrate this information !
do you know it .. ! because it will help me understand
All Stations To Central
All are positive in the first quad
sin is pos in the second
tan is pos in the third and
cos is pos in the 4th.