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In DeltaABC, c cos(A -alpha) + acos(C +...

In `DeltaABC, c cos(A -alpha) + acos(C + alpha)` is equal to

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In Delta ABC , prove that c cos (A - alpha) + a cos (C + alpha) = b cos alpha

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(sqrt(2)-sin alpha - cos alpha)/(sin alpha - cos alpha) is equal to

The determinant Delta = |(b,c,b alpha +c),(c,d,c alpha + d),(b alpha + c,c alpha + d,a a^(3) - c alpha)| is equal to zero, if

The determinant Delta = |(b,c,b alpha +c),(c,d,c alpha + d),(b alpha + c,c alpha + d,a a^(3) - c alpha)| is equal to zero, if

If sin alpha + cos alpha = b then sin 2 alpha is equal to . . . . .

(sqrt(2)-sin alpha-cos alpha)/(sin alpha-cos alpha) is equal to