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Multiplication of Matrices

50 If xcosB -...

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50 If xcosB - cosA =0 and ysinB -cosA= 0 then the value of cos square A will be?

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sin A + sin B + sin C = 0

cos A + cos B + cos C = 0

cos (A + B) + cos (B + C) + cos (C + A) =

Q. Prove that :

\frac{sin A - sin B}{cos A + cos B} + \frac{cos A - cos B}{sin A + sin B} = 0

cos a + cos b + cos c = sin a + sin b + sin c = 0

cos (a - b) + cos (b - c) + cos (c - a) = - \frac{3}{2}

.

cos (B - C) + cos (C - A) + cos (A - B) = - \frac{3}{2}

cos A + cos B + cos C = 0

sin A + sin B + sin C = 0

Q. The value of

\frac{sin A - sin B}{cos A + cos B} + \frac{cos A - cos B}{sin A + sin B}

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