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snickerzzz

  • 3 years ago

how do you find the sum of the series sigma n=0 ; 4 (cosn*pi) (3/4)^n

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  1. RONNCC
    • 3 years ago
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    use the equation maker

  2. snickerzzz
    • 3 years ago
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    \[\sum_{n=0}^{\infty} 4 (\cos n \pi) (\frac{ 3 }{ 4 })^{n}\]

  3. RONNCC
    • 3 years ago
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    are you sure it is till infinity?

  4. snickerzzz
    • 3 years ago
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    yes

  5. TuringTest
    • 3 years ago
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    Perhaps you can use some trig identities in conjunction with the ratio test.

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