If b-c-3 a- then B - 2 C - 2 is equal toA- 3B- 1C- 4D- 2

The correct option is D 2 cotB/2.cotC/2 =s(s b)/Δ.s(s c)/Δ =s/s a=2a/2a a=2(∵ b+c=3a ∴ s= 2a) ...

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Sign of Trigonometric Ratios in Different Quadrants

If b+c=3 a, t...

Question

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

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If \to a, \to b, \to c

| \to a + \to b + \to c |

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cot (\frac{B}{2}) cot (\frac{C}{2})

\vec{a} and \vec{b}

|\vec{a}| = 1, |\vec{b}| = 2,

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a : b = c : d = e : f = 1 : 2

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