In any triangle ABC Prove that :- sin(B-C)/sin(B+C)=(bb-cc)/aa

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Q. For any triangle ABC prove sin(B-C)/sin(B+C)=b²-c²/a².

Q. For any triangle

Δ A B C

prove that

\frac{sin (B - C)}{sin (B + C)} = \frac{b^{2} - c^{2}}{a^{2}}

$In any Δ A B C, prove that : \frac{b s e c B + c s e c C}{t a n B + t a n C} = \frac{c s e c C + a s e c A}{t a n C + t a n A} = \frac{a s e c A + b s e c B}{t a n A + t a n B}$

Q. In any triangle ABC, prove by vector method

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prove that

a^{2}, b^{2}

and

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are in A.P.

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