If in triangle ABC- - A-60o- then 1- a c - b c 1- c b - a b is-

Ans. (3) L.H.S= b ^ 2 + c ^ 2 a ^ 2 +2bc bc =2cos A +2=3 [ ∵∠ A=60^o] ...

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Trigonometric Identities

If in triangl...

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If in triangle $A B C$ , $∠ A = 60^{o}$ , then
$(1 + \frac{a}{c} + \frac{b}{c}) (1 + \frac{c}{b} - \frac{a}{b})$ is....

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If in a triangle ABC, $∠ C = 60^{o},$ then $\frac{1}{a + c} + \frac{1}{b + c} =$
[IIT 1975]

a = 2, b = 1 + \sqrt{3}

∠

= 60^{o}

△ A B C

\frac{1}{a + b} + \frac{1}{a + c} = \frac{3}{a + b + c}

∠ A = 60^{o}

∠ B = 60^{o}

A B C,

\frac{1}{a + c} + \frac{1}{b + c} = \frac{3}{a + b + c},

∠ c

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