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Fungrim entry: caf8cf

Re ⁣((a+bi)c+di)=Mcedθcos ⁣(cθ+dlog(M))   where M=a+bi,θ=arg ⁣(a+bi)\operatorname{Re}\!\left({\left(a + b i\right)}^{c + d i}\right) = {M}^{c} {e}^{-d \theta} \cos\!\left(c \theta + d \log(M)\right)\; \text{ where } M = \left|a + b i\right|,\,\theta = \arg\!\left(a + b i\right)
Assumptions:aRandbRandcRanddRanda+bi0a \in \mathbb{R} \,\mathbin{\operatorname{and}}\, b \in \mathbb{R} \,\mathbin{\operatorname{and}}\, c \in \mathbb{R} \,\mathbin{\operatorname{and}}\, d \in \mathbb{R} \,\mathbin{\operatorname{and}}\, a + b i \ne 0
TeX:
\operatorname{Re}\!\left({\left(a + b i\right)}^{c + d i}\right) = {M}^{c} {e}^{-d \theta} \cos\!\left(c \theta + d \log(M)\right)\; \text{ where } M = \left|a + b i\right|,\,\theta = \arg\!\left(a + b i\right)

a \in \mathbb{R} \,\mathbin{\operatorname{and}}\, b \in \mathbb{R} \,\mathbin{\operatorname{and}}\, c \in \mathbb{R} \,\mathbin{\operatorname{and}}\, d \in \mathbb{R} \,\mathbin{\operatorname{and}}\, a + b i \ne 0
Definitions:
Fungrim symbol Notation Short description
ReRe(z)\operatorname{Re}(z) Real part
Powab{a}^{b} Power
ConstIii Imaginary unit
Expez{e}^{z} Exponential function
Loglog(z)\log(z) Natural logarithm
Absz\left|z\right| Absolute value
Argarg(z)\arg(z) Complex argument
RRR\mathbb{R} Real numbers
Source code for this entry:
Entry(ID("caf8cf"),
    Formula(Equal(Re(Pow(Add(a, Mul(b, ConstI)), Add(c, Mul(d, ConstI)))), Where(Mul(Mul(Pow(M, c), Exp(Neg(Mul(d, theta)))), Cos(Add(Mul(c, theta), Mul(d, Log(M))))), Equal(M, Abs(Add(a, Mul(b, ConstI)))), Equal(theta, Arg(Add(a, Mul(b, ConstI))))))),
    Variables(a, b, c, d),
    Assumptions(And(Element(a, RR), Element(b, RR), Element(c, RR), Element(d, RR), Unequal(Add(a, Mul(b, ConstI)), 0))))

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Copyright (C) Fredrik Johansson and contributors. Fungrim is provided under the MIT license. The source code is on GitHub.

2019-10-05 13:11:19.856591 UTC