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的精確無窮級數公式(即π的萊布尼茨公式)直到約1000年後才由印度數學家發現。 ... 的十進位精度已高達1013位。 ...... 原始內容 (PDF)存檔於2014-02-01) (拉丁語).
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You can use the triple angle and the quadruple angle formula for cosine.
更多資訊〈Explain how to compute $\cos(2\pi/13)$ by solving quadratic and ... 〉
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Prove that: 2cospi,(13)cos(9pi),(13)+cos(3pi),(13)+cos(5pi),(13)=0. ... Prove that: 2cosπ13cos9π13+cos3π13+cos5π13=0. 544.9 K+. 452.2 K+. 226.1 K+.
Let x=cosπ/13, then we have −1=cosπ=T13(x) (Chebyshev polynomial of first kind), i.e. T13(x)+1=0. That's a polynomial equation with integer coefficients, the ...
更多資訊〈How to prove that $\cos(\frac[\pi][13])$ is algebraic and not ... 〉
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The expression cos(10pi),13+cos(8pi),13+cos(3pi),13+cos(5pi),13 is equal to. ... The expression cos(10π)13+cos(8π)13+cos(3π)13+cos(5π)13 is equal to.
更多資訊〈The expression cos(10pi)/13+cos(8pi)/13+cos(3pi ... - Doubtnut 〉