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Fungrim entry: cf64b3

atan(x)+atan(y)=atan2 ⁣(x+y,1xy)\operatorname{atan}(x) + \operatorname{atan}(y) = \operatorname{atan2}\!\left(x + y, 1 - x y\right)
Assumptions:xRandyRx \in \mathbb{R} \,\mathbin{\operatorname{and}}\, y \in \mathbb{R}
TeX:
\operatorname{atan}(x) + \operatorname{atan}(y) = \operatorname{atan2}\!\left(x + y, 1 - x y\right)

x \in \mathbb{R} \,\mathbin{\operatorname{and}}\, y \in \mathbb{R}
Definitions:
Fungrim symbol Notation Short description
Atanatan(z)\operatorname{atan}(z) Inverse tangent
Atan2atan2 ⁣(y,x)\operatorname{atan2}\!\left(y, x\right) Two-argument inverse tangent
RRR\mathbb{R} Real numbers
Source code for this entry:
Entry(ID("cf64b3"),
    Formula(Equal(Add(Atan(x), Atan(y)), Atan2(Add(x, y), Sub(1, Mul(x, y))))),
    Variables(x, y),
    Assumptions(And(Element(x, RR), Element(y, RR))))

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2020-01-31 18:09:28.494564 UTC