y=arctan的微分怎么算. [最佳答案] 两边取tan tan y = x(tan y)' = 1(1 / cos^2 y) * y' =1 y' = cos^2 y = cos^2 y / (sin^2 y + cos^2 y) = 1 / (tan^2 y + 1) = 1 ...
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