If sin θ = -1/2 for 0 o, the value of θ is
A
30o and 150o
B
150o and 210o
C
210o and 330o
D
150o and 330o
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
sin θ = -1/2
= -0.5
θ = sin-1 (0.5)
θ = 30o
Since θ is negative
θ = 180 + 30 = 210o
θ = 360 - 30 = 330o
∴θ = 210o and 330o
Source: Myschool Past Questions Archive (Record #8467)