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Hey i really need some help this question two confused me a lot for while like i know i need to use sines law

(2) Let [u, v, w] be a positively oriented spherical triangle in $2 with edge lengths a, b and c and angles a, B and
y. a Given that a = cos 1 2, B = 2quot; and y = quot;, find b. b Given that a = quot;, a = 3quot; and B = cos-12, find
c and y. c Given that a = quot;, b = quot; and a = quot; find all possible values of c.