1.

If sin α + sin β = a and cos α - cos β = b, then the value of \(\tan \left( {\frac{{\alpha - \beta }}{2}} \right)\) will be

A. a + b
B. a - b
C. \(- \frac{a}{b}\)
D. \( - \frac{b}{a}\)
Answer» E.


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