Re: How do u go about doing this---?
- To: mathgroup@smc.vnet.net
- Subject: [mg10950] Re: [mg10844] How do u go about doing this---?
- From: BobHanlon@aol.com
- Date: Sat, 14 Feb 1998 00:53:22 -0500
f[x_, y_] := (Sin[x] + Cos[y])/(Sin[x] - Cos[y])
D[f[x, y], x]^2 + D[f[x, y], y]^2
(Cos[x]/(Sin[x] - Cos[y]) -
(Cos[x]*(Cos[y] + Sin[x]))/(Sin[x] - Cos[y])^2)^2 +
(-(((Cos[y] + Sin[x])*Sin[y])/(Sin[x] - Cos[y])^2) -
Sin[y]/(Sin[x] - Cos[y]))^2
Simplify[%]
(Cos[2*(x - y)] + Cos[2*(x + y)] + 2)/(Cos[y] - Sin[x])^4
Bob Hanlon