求导运算:y=tan(x+y),

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求导运算:y=tan(x+y),
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求导运算:y=tan(x+y),
求导运算:y=tan(x+y),

求导运算:y=tan(x+y),
y=tan(x+y)
y'=sec(x+y)(x+y)'
y'=sec(x+y)(1+y')
y'=sec(x+y)+y'sec(x+y)
y'-y'sec(x+y)=sec(x+y)
y'[1-sec(x+y)]=sec(x+y)
y'=sec(x+y)/[1-sec(x+y)]
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