Grade 11Discuss with colleagues and IITians
how to prove a(cosB+cosC)=2(b+c)sin^2A/2
how to prove a(cosB+cosC)=2(b+c)sin^2A/2
1 Answer
SAGAR SINGH - IIT DELHI
Approved Tutor Answer15 Years agoDear student,
Use cosine law
cosB=a2+c2-b2/2ac
cosC=a2+b2-c2/2ab
Now prove LHS=RHS
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