... 三角级数论 theory of trigonometric series 三角解（法） trigonometric solution 三角近似法 trigonometric approximation ...
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三角形解法 [数] solution of triangle ; solution by a triangle ; triangle computations
尼日尔三角洲解放运动 MEND ; Movement for the Emancipation of the Niger Delta
三角分解 triangle decomposition ; triangular factorization ; lu
三角形图解 triangular diagram
三角分解法 Triangular Factorization ; Triangular decomposition ; the method of triangular decomposition ; LU decomposition
三角形解谜 Delta Riddle
正三角形解 [数] equilateral triangular point solution
三角州解放运动组织 MEND
他找到了一本自己曾经发表过的名为《百慕大三角之谜——已解》的书。
What he found he published in his own book entitled The Bermuda Triangle mystery-solved.
摘要利用由三角级数和幂级数复合构成的函数项级数的有关性质，得到了一类变系数非齐次调和方程边值问题的级数解。
In this paper by using the property of Fourier series a compound series consisting of trigonometric series and power series is established.
该解与以运动许可的三角形速度场得到的上界解进行比较表明，有时本解法可得到更低的上界值。
Compared with that using a kimematically admissble triangular velocity field, the solution can give enen lower values than that of a kimematically admissble triangular velocity field sometimes.
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