(b-c)^2 × cos^2(A/2)+(b+c)^2 × sin^2(A/2)
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this is the required solution
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kcbhola123:
no u r wrong u cant cancel (b+c)^2 & (b-c)^2
i have solved the problem again but now i can't changwmy answer.......
change my*
the answer is b^2 + c^2 +2bc cosA
sorry b^2 +c^2 -2bc cosA
ans is a^2
where is a in the question
a is the side
i can't figure out where is the side, the question you posted is just (b-c)^2 cos^2(A/2) +(b+c)^2 sin^2 (A/2)
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