In triangle abc 3sinb + 4cosc = 6 and 4sinc + 3cosb = 1
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square and add both the equation
25 +24sin(b+c)=37
b+c=30° and a=150°
or vice versa
25 +24sin(b+c)=37
b+c=30° and a=150°
or vice versa
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