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Question

If b+c=3a, then cot B/2 cot C/2 is equal to



A

3

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B

1

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C

4

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D

2

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Solution

The correct option is D

2


cotB2.cotC2=s(sb)Δ.s(sc)Δ=ssa=2a2aa=2(b+c=3as=2a)


Mathematics

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