诱导公式二分之几π加减a,有口诀“奇变偶不变”,那π的系数为14,18是否能用? 知乎 Template




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tomski诱导公式二分之几π加减a,有口诀“奇变偶不变”,那π的系数为14,18是否能用? 知乎 coloring