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Re: Wrong Simplify[] Answer for Simplify[Cos[x]^4-Sin[x]^4]?

• To: mathgroup at smc.vnet.net
• Subject: [mg104416] Re: Wrong Simplify[] Answer for Simplify[Cos[x]^4-Sin[x]^4]?
• From: CuppoJava <patrickli_2001 at hotmail.com>
• Date: Sat, 31 Oct 2009 01:50:18 -0500 (EST)
• References: <hce437$r4t$1@smc.vnet.net>

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

hope this helps
  -Patrick