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shifan:
For first question use cosine rule and for second one use sine rule. I don't know abt 3rd one
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2
cosa=0.5
angle b =42degree
angle b =42degree
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Q2.a/sinA=b/sinb
2/2/3=3/sinb
2×3/2=3/sinb
sinb=1
b=pie/2
2/2/3=3/sinb
2×3/2=3/sinb
sinb=1
b=pie/2
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