Question

19) If Cosx = -1/2 lies in third quadrant, then sinx=?​

Answer 1

Answer:

Cos = base / hypotenuse = -1/2

Base =-1

Hypotenuse = 2

H^2=B^2+P^2

2^2=(-1)^2+P^2

4=1+P^2

P^2=4-1

P^2=3

P=√3

Sin x = Perpendicular/Hypotenuse

Sin x = √3/2 is the answer of this question