Question

The terminal side of angle α is in quadrant III. What sign, positive or negative, will the sine, cosine, and tangent values for angle α have and why?

Answer 1

In quadrant III, the x-coordinate of a point is negative and the y-coordinate of a point is also negative. Therefore, the signs of the trigonometric ratios are as follows:

- Sine: negative (y-coordinate is negative)

- Cos