A. (-square root of 3, -1)
B. (-1, square root of 3)
C. (1, -square root of 3)
D. (-1, -square root of 3)
E. (1, square root of 3)
The answer is D. Can someone please explain why? And perhaps what terminal side means?
1.33 * π * 360 = 239º
============
sin(239º) = 0.857
2 * sin(239º) = -1.732 ?
i know trig but have no idea what they are talking about !
need more coffee !
November 22nd, 2008 at 1:23 am
1.33 * π * 360 = 239º
============
sin(239º) = 0.857
2 * sin(239º) = -1.732 ?
i know trig but have no idea what they are talking about !
need more coffee !
References :
November 22nd, 2008 at 1:53 am
tan(4pi/3) = sqrt(3) = -sqrt(3)/(-1), since 4pi/3 is in the third quadrant, and the reference angle of 4pi/3 is pi/3.
Therefore, the answer is D. (-1, -square root of 3)
References :
November 22nd, 2008 at 2:03 am
D. The angle is in the third quadrant and so the x and y values should both be negative. And if you know the unit circle coordinate, multiply it by 2, and you get D
References :