11题 求助过程
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g(x,y) =(x+1)^(ysinx)
lng(x,y) =ysinx. ln(x+1)
g'x(x,y)/g(x,y) = ycosx .ln(x+1) + ysinx/(x+1)
g'x(x,y) = [ycosx .ln(x+1) + ysinx/(x+1)]. (x+1)^(ysinx)
g'x(0,0) = 0
h(x,y) = x^2.cos(xy^2)
h'x(x,y) = x^2.[-sin(xy^2) ].( y^2) + 2x.cos(xy^2)
h'x(0,0) =0
f(x,y) = (x+1)^(ysinx)+x^2.cos(xy^2)
f'x(0,0) =g'x(0,0) +h'x(0,0) =0
lng(x,y) =ysinx. ln(x+1)
g'x(x,y)/g(x,y) = ycosx .ln(x+1) + ysinx/(x+1)
g'x(x,y) = [ycosx .ln(x+1) + ysinx/(x+1)]. (x+1)^(ysinx)
g'x(0,0) = 0
h(x,y) = x^2.cos(xy^2)
h'x(x,y) = x^2.[-sin(xy^2) ].( y^2) + 2x.cos(xy^2)
h'x(0,0) =0
f(x,y) = (x+1)^(ysinx)+x^2.cos(xy^2)
f'x(0,0) =g'x(0,0) +h'x(0,0) =0
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