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本文链接：http://21taiyang.com/Gyms/7539192.html
sec方x等于[拼音：yú]什么转载请注明出处来源