от martin123456 » 13 Фев 2010, 13:18
[tex]dz=(ln(\frac{x+\sqrt{x^2-y^2} }{x-\sqrt{x^2-y^2} }))'|x+(ln(\frac{x+\sqrt{x^2-y^2} }{x-\sqrt{x^2-y^2} }))'|y[/tex]
[tex]dz=\frac{(\frac{x+\sqrt{x^2-y^2} }{x-\sqrt{x^2-y^2} })'|x}{\frac{x+\sqrt{x^2-y^2} }{x-\sqrt{x^2-y^2}}}+\frac{{(\frac{x+\sqrt{x^2-y^2} }{x-\sqrt{x^2-y^2} })'|y}}{\frac{x+\sqrt{x^2-y^2} }{x-\sqrt{x^2-y^2}}[/tex]
[tex]dz=\frac{\frac{(1+\frac{x}{\sqrt{x^2-y^2}})(x-\sqrt{x^2-y^2})-(x+\sqrt{x^2-y^2})(1-\frac{x}{\sqrt{x^2-y^2}})}{(x-\sqrt{x^2-y^2})^2}}{\frac{x+\sqrt{x^2-y^2} }{x-\sqrt{x^2-y^2}}}+\frac{\frac{-\frac{y}{\sqrt{x^2-y^2}}(x-\sqrt{x^2-y^2})+(x+\sqrt{x^2-y^2})(\frac{y}{\sqrt{x^2-y^2}})}{(x-\sqrt{x^2-y^2})^2}}{\frac{x+\sqrt{x^2-y^2} }{x-\sqrt{x^2-y^2}}[/tex]