Question: One, Two, Three (a) Show that tan(tan -1 1 + tan -1 2 + tan -1 3) = 0. (b) Conclude from part (a) that

One, Two, Three

(a) Show that tan(tan-1 1 + tan-1 2 + tan-1 3) = 0.

(b) Conclude from part (a) that

tan-1 1 + tan-1 2 + tan-1 3 = π

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