Question 779616
Find all angles  in radians in the domain 0<beta(B)&#8804;2 pi for:
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a) sin beta (B) = 1/sqrt2
B=&#960;/4, 3&#960;/4 (in quadrants 1 and 2 where sin>0)
.. 
b) cos beta (B) = 1/2
B=&#960;/3, 5&#960;/3 (in quadrants 1 and 4 where cos>0)
..
c) 2sin beta (B) = sqrt3
sin (B)=sqrt3/2=&#960;/3, 2&#960;/3 (in quadrants 1 and 2 where sin>0)