2.求导数:(1)y=sinx^3+(sinx)^3.(2)y=√[1+(lnx)^2]RT

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2.求导数:(1)y=sinx^3+(sinx)^3.(2)y=√[1+(lnx)^2]RT
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2.求导数:(1)y=sinx^3+(sinx)^3.(2)y=√[1+(lnx)^2]RT
2.求导数:(1)y=sinx^3+(sinx)^3.(2)y=√[1+(lnx)^2]
RT

2.求导数:(1)y=sinx^3+(sinx)^3.(2)y=√[1+(lnx)^2]RT
(1)y’=(cosx)^3*(x^3)’+3(sinx)^2*(sinx)’
=3x^2cosx^3+3(sinx)^2*cosx
(2)y’=1/2[1+(lnx)^2]^(-1/2)*[1+(lnx)^2]’
=1/2[1+(lnx)^2]^(-1/2)*2lnx*(lnx)’
=1/2[1+(lnx)^2]^(-1/2)*2lnx/x
=lnx/x√[1+(lnx)^2]

Y'=3SIN3X+3(SINX)^2(-cosx)
y'=2lnx/(x√[1+(lnx)^2])

(1) dy/dx=(3x^2)cos(x^3)=3(sinx)^2(cosx)
(2)dy/dx=[2(lnx)/x]/2(/[1+(lnx)^2]

【1】y=sinx³+sin³x
y'=cosx³*3x²+3sin²x*cosx
y'=3x²cosx³+3sin²xcosx
【2】y=√(1+ln²x)
y'=1/2√(1+ln²x)*2lnx*1/x
y'=lnx/[x√(1+ln²x)]