MathGroup Archive 2011

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Re: Simplify[ArcTan[Tan[a] + Tan[b]]]


Since
tg(a) + tg(b) = sin(a+b)/[cos(a)*cos(b)] = tg(a+b)*[1-tg(a)*tg(b)] =
[tg(a)*tg(b)]*[cotg(a) + cotg(b)]
maybe Mathematica is right...




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