Dx Code M54.16
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179 31 Aug 29, 2015 · 虽然题主只是问了怎么查找外文文献的DOI号，但是为了保证回答的完整性，下面我会和大家分别讲一讲 中文文献和英文文献的DOI号查找方法。先对DOI做一个简单科普！ …
Dx Code M54.16Aug 1, 2022 · cosx的四次方的积分： 原式=∫ (cosx)^4 dx。 =∫ (1-sinx^2)cosx^2dx。 =∫cosx^2dx-∫sinx^2cosx^2dx。 =∫ (1/2) (1+cos2x)x-∫ (1/4) [ (1-cos4x)/2]dx。 = (x/2)+ (1/4)sin2x- (x/8)+ … DX DY DX