prove that a + ba - b = tan A + B 2cotA

prove that $\frac{a + b}{a - b} = \tan (\frac{A + B}{2}) c o t (\frac{A - B}{2})$ .

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prove that a + ba - b = tan A + B 2cotA - B 2 .

prove that $\frac{a + b}{a - b} = \tan (\frac{A + B}{2}) c o t (\frac{A - B}{2})$ .