TRIGONOMETRY please help thank you <3

Question

If sin θ =1/7 and t is in quadrant II, find the following;

a. sin (θ/2) b. cos = (θ/2)

with an explanation if possible... <3

Answer 1

cosθ = - √1 - 1/49 = -√48/49 = - 4√3/7; θ/2 in quadrant I.

a. sinθ/2 = √(1- cosθ)/2 = √(1 + 4√3/7)2 = √(7 +4√3)/14

bcosθ/2 = √(1+cosθ)/2 = √(1 - 4√3/7)2 = √(7 - 4√3)/14