Quickly converging series for cos

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    Converging Cos Series
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SUMMARY

The discussion focuses on finding a series for cos(x) that converges quickly for values between 0 and 2π. Users highlight that the standard Taylor series requires up to the 10th term for adequate accuracy at cos(2π). Alternatives such as Simpson's method and Taylor expansion are recommended for improved convergence, especially within smaller intervals like 0 to π/2, which can enhance overall accuracy.

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  • Understanding of Taylor series expansion
  • Familiarity with Simpson's method for numerical integration
  • Knowledge of trigonometric functions and their properties
  • Basic calculus concepts related to series convergence
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Deadstar
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Hey folks just wondering whether anyone here knew of a series for cos(x) that converges fairly quickly for values between 0 and 2*pi? The 'usual' series takes up to around the 10th term before it starts looking decent for cos(2*pi) for example.
 
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Why do you need it for that range? If you use it from 0 to π/2, you can easily get it for the rest of the interval.
 
Simpson's method is pretty good. You could also try Taylor expansion.

mathman has a good suggestion. The smaller the range the easier it is to get better accuracy throughout.
 

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