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TrigExpand

• To: mathgroup at smc.vnet.net
• Subject: [mg32410] TrigExpand
• From: "Dave Snead" <dsnead6 at charter.net>
• Date: Sat, 19 Jan 2002 01:16:55 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Using Mathematica 4.1, what's going on with Trig Expand?

TrigExpand[Cos[x]^2]
returns
Cos[x]^2

But
TrigExpand[y+Cos[x]^2]
returns
1/2 + y + Cos[x]^2/2 - Sin[x]^2/2

Why doesn't it just leave the argument alone and return
y+Cos[x]^2 ?