RE: How do u go about doing this---?
- To: mathgroup@smc.vnet.net
- Subject: [mg10898] RE: [mg10844] How do u go about doing this---?
- From: R Finley <trfin@umsmed.edu>
- Date: Thu, 12 Feb 1998 20:15:33 -0500
L,
f[x_,y_] := (Sin[x] + Cos[y])/(Sin[x] - Cos[y])
Simplify[D[f[x,y],x]^2 + D[f[x,y],y]^2]
Gives you the answer you desire.
RF
-----Original Message-----
From: McAllister [SMTP:lmcallister@email.msn.com] To:
mathgroup@smc.vnet.net
Sent: Tuesday, February 10, 1998 8:02 PM To: mathgroup@smc.vnet.net
Subject: [mg10844] 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.