Question

tangent a + tangent b divided by cot a + cot b equals to tangent a * tangent b

Answer 1

tan a + tan b / cot a + cot b = tan(a*b)
tan a/cot a+ tan b / cot b= tan(a*b)
Sina/cosa / sinb/cosb / cosa/Sina / cosb/sinb = tan(a*b).
cancel it you'll get it.

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