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open parenthesis and reduce an expression

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75102] open parenthesis and reduce an expression
  • From: "kem" <kemelmi at gmail.com>
  • Date: Mon, 16 Apr 2007 20:23:45 -0400 (EDT)

Hi, How can I reduce the following formula for instance
(Cos[b[x,y]] zx[x,y]-Sin[b[x,y]] zy[x,y]) (zxx Cos[b[x,y]]+zyx
Cos[b[x,y]]+
      zxx Sin[b[x,y]]-zyx Sin[b[x,y]]+bx (Cos[b[x,y]]-Sin[b[x,y]])
zx[x,y]-
      bx (Cos[b[x,y]]+Sin[b[x,y]]) zy[x,y])

to the formula
zxx zx + zyx zx
in mathematica?

I know that such a reduction is possible since I did it manually, I
just need to test it on more complex expressions.

Thank you very much

kem



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