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y'=n(sinx)^(n-1)cosxcosnx+(sinx)^n(-nsinnx)
=n(sinx)^(n-1)(cosxcosnx-sinxsinnx)
=n(sinx)^(n-1)cos(x+nx)
=n(sinx)^(n-1)(cosxcosnx-sinxsinnx)
=n(sinx)^(n-1)cos(x+nx)
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追答
sin²y=2/(x+1)-1
2sinycosyy'=-2/(x+1)²
y'=-1/(x+1)²√(2/(x+1)-1)√(2-2/(x+1))
=-1/(x+1)√((1-x)2x(x+1))
=-1/(x+1)√(2x-2x³)
e^2y=e^4x/(e^4x+1)
e^(-2y)=1+e^(-4x)
-2e^(-2y)y'=-4e^(-4x)
y'=2e^(-4x)/e^(-2y)=2/(e^4x+1)
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