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MathGroup Archive 1998

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How do u go about doing this---?




Let f(x) = sin(x)+cos(y)
                -----------------
                sin(x) - cos(y)

Show that
                (df/dx)^2 + (df/dy)^2    =

                2+cos(2(x-y))+cos(2(x+y))
                -----------------------------------
                            (sin(x)-cos(y))^4


Thanks,

L.





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