4-6
.pdfan |
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(−1) n X 2 n |
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(2 n)! |
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an |
+ 1 = |
(−1) ( n+1) X 2 ( n+1) |
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(2 (n + 1))! |
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q = |
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n |
+ 1 (−1) ( n +1) X 2 ( n +1) |
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(2 n)! |
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X 2 |
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a |
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(2 (n + 1))! |
(−1) n X 2 n |
(2n + 1)(2n + 2) |
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n |
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X 0 |
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X 2 |
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2 |
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