rachelmaddie
Full Member
- Joined
- Aug 30, 2019
- Messages
- 851
Can someone please check this?
Sin 3pi/2
1. Draw the triangle in the 3rd quadrant.
Cos 3pi / 2 = 0 because the adjacent = 0 and the hypotenuse = -1 at theta = 3pi/2
Therefore cos 3pi/2 = 0 / -1
2. Sin theta in the third quadrant = opp / hyp
= negative / 1
Therefore your answer should be negative.
3. Therefore sin 3pi/2 = 0 / -1 = 0