复合函数求导
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(29)
y=arctan[x+√(1+x^2) ]
dy/dx
= {1/(1+[x+√(1+x^2) ]^2 ) } . d/dx [x+√(1+x^2) ]
= {1/(1+[x+√(1+x^2) ]^2 ) } . [1+ x/√(1+x^2) ]
=(1/2). {1/ (x[x +√(1+x^2)] ) } . { [x+√(1+x^2)] /√(1+x^2) }
=(1/2) { 1/[ x.√(1+x^2)] }
(30)
y=arccos[ (cosx)^2]
cosy = (cosx)^2
-siny. dy/dx = -2cosx.sinx
dy/dx
= 2sinx.cosx/siny
= 2sinx.cosx/√ [ 1- (cosx)^4 ]
= 2cosx/√[1+ (cosx)^2 ]
y=arctan[x+√(1+x^2) ]
dy/dx
= {1/(1+[x+√(1+x^2) ]^2 ) } . d/dx [x+√(1+x^2) ]
= {1/(1+[x+√(1+x^2) ]^2 ) } . [1+ x/√(1+x^2) ]
=(1/2). {1/ (x[x +√(1+x^2)] ) } . { [x+√(1+x^2)] /√(1+x^2) }
=(1/2) { 1/[ x.√(1+x^2)] }
(30)
y=arccos[ (cosx)^2]
cosy = (cosx)^2
-siny. dy/dx = -2cosx.sinx
dy/dx
= 2sinx.cosx/siny
= 2sinx.cosx/√ [ 1- (cosx)^4 ]
= 2cosx/√[1+ (cosx)^2 ]
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