in any triangle prove that a^ 2 + bc= b^ 2+c^ 2 if A= 60
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Answered by
1
Answer:
Given ∠A=60
°
in △ABC.
Applying cosine rule to △ABC,
cosA=
2.AB.AC
AB
2
+AC
2
−BC
2
cos60=
2.AB.AC
AB
2
+AC
2
−BC
2
2
1
=
2.AB.AC
AB
2
+AC
2
−BC
2
∴BC
2
=AB
2
+AC
2
−AB.AC
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0
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