Q10 of 87 Page 10

In any ∆ABC, find the value of ∑ a (sin B – sin C)



a(sinB - sinC) + b(sinC - sinA) + c(sinA - sinB)


We know,


By Sine law,



a(Kb-Kc)+b(Kc-Ka)+c(Ka-Kb)


K(ab-ac+bc-ab+ac-bc)=0




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