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a+b+c=π/2 show that {(1-tan a/2)(1-tan b/2)(1-tan c/2)}/{1+tan a/2)(1+tan b/2)(1+tan c/2)} = (sin a + sin b + sin c - 1)/(cos a + cos b + cos c)

a+b+c=π/2 show that {(1-tan a/2)(1-tan b/2)(1-tan c/2)}/{1+tan a/2)(1+tan b/2)(1+tan c/2)} = (sin a + sin b + sin c - 1)/(cos a + cos b + cos c)

Grade:12th pass

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