AngouriMath

Navigation

← Back to list of members

SolveAPolynomialInASineOverAPowerOfABinomialInItInPowersOfTheBinomial​(AngouriMath.​Entity,​AngouriMath.​Entity.​Variable)

 Method (no overloads)

Summary

A polynomial in a sine or a cosine of a linear over a whole power of a binomial in it,
(A + B cos(y) + C cos(y)^2)/(a + b cos(y))^4, written in powers of the binomial:
with u = a + b f, f = (u - a)/b, and P(f)/u^n = sum c_j u^(j - n) with
c_j = sum_(i >= j) p_i C(i, j) (-a)^(i - j)/b^i, each power of the binomial its own
question.

Remarks

The rules after it took the whole quotient through the half-angle and wrote 30 million
characters for (A + B cos(x) + C cos(x)^2)/(a + b cos(x))^4 in eighteen seconds, where
1/(a + b cos(x))^4 alone is 44 thousand. Rubi's 4.1.4 and 4.2.4
(a + b cos)^m (A + B cos + C cos^2) at m = -4 timed out. An even whole power
of the other function above the bar is a power of 1 - f^2, exactly, and read as
one: Rubi's 4.1.2.2 cos(c + d x)^6 sin(c + d x)^3/(a + b sin(c + d x))^2 and its
kin timed out too, where in the sine each is the polynomial over the power.
https://github.com/asc-community/AngouriMath/issues/718
https://github.com/asc-community/AngouriMath/issues/233

























Angouri © 2019-2023 · Project's repo · Site's repo · Octicons · Transparency · 4862 pages online