secx平方的导数？y = sec² xy" = 2 sec x sec x tanx = 2 sec³ x sin x = 2 sinx / cos³ x......记住几个公式：sec x =
secx平方的导数？
y = sec² xy" = 2 sec x sec x tanx = 2 sec³ x sin x = 2 sinx / cos³ x......记住几个公式：sec x = 1/cos x(sec x)" = sec x tan x = sinx/cos²x
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