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as r < <1 apparantly this 1/8 (-r^4 cos(4 x) + 2 r^3 cos(3 x) - 2 r^3 cos(x) + r^4) reduces to approx 1/8
as r<<1 apparantly this 1/8 (-r^4 cos(4 x) + 2 r^3 cos(3 x) - 2 r^3 cos(x) + r^4) reduces to approx 1/8 r^3
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An Introduction to Analysis
Authors: William R. Wade
4th edition
132296381, 978-0132296380
