Question

For the value of Θ, use half angle formula find Sin(1/2)Θ

Θ=300 degrees

Answer 1

cosA=1- 2sin(A/2)^2
now A=300
then cosA=1/2
therfore
1/2=1-2sin(A/2)^2
=>2sin(A/2)^2=1-1/2
=>sin(A/2)^2=1/4
=>sin(A/2)=1/2
as A=150 and it is in the second quadrant