大学高等数学,图片中划线的那题怎么做,谢谢
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5. y/x = tanv, v = arctan(y/x),
x^2+y^2 = e^(2u), u = (1/2)ln(x^2+y^2)
z = uv = (1/2)ln(x^2+y^2) arctan(y/x)
z'<x> = [x/(x^2+y^2)]arctan(y/x)
- (1/2)[y/(x^2+y^2)]ln(x^2+y^2)
z'<y> = [y/(x^2+y^2)]arctan(y/x)
+ (1/2)[x/(x^2+y^2)]ln(x^2+y^2)
x^2+y^2 = e^(2u), u = (1/2)ln(x^2+y^2)
z = uv = (1/2)ln(x^2+y^2) arctan(y/x)
z'<x> = [x/(x^2+y^2)]arctan(y/x)
- (1/2)[y/(x^2+y^2)]ln(x^2+y^2)
z'<y> = [y/(x^2+y^2)]arctan(y/x)
+ (1/2)[x/(x^2+y^2)]ln(x^2+y^2)
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天才呀,你怎么做到的
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