[Merged by Bors] - feat(ring_theory/power_series): define power series for exp, sin, cos, and 1 / (u - x).
#5432
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exp, sin, cos, and 1 / (u - x).exp, sin, cos, and 1 / (u - x).
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… `cos`, and `1 / (u - x)`. (#5432) This PR defines `power_series.exp` etc to be formal power series for the corresponding functions. Once we have a bridge to `is_analytic`, we should redefine `complex.exp` etc using these power series.
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exp, sin, cos, and 1 / (u - x).exp, sin, cos, and 1 / (u - x).
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This PR defines
power_series.expetc to be formal power series for the corresponding functions. Once we have a bridge tois_analytic, we should redefinecomplex.expetc using these power series.Should I move
ring_theory/power_seriestoring_theory/power_series/basic, and this new file toring_theory/power_series/SOME_NAME?