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Simplify[expr] bug?

• To: mathgroup at smc.vnet.net
• Subject: [mg53398] Simplify[expr] bug?
• From: Ken Tozier <kentozier at comcast.net>
• Date: Sun, 9 Jan 2005 23:04:00 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

I'm a complete newbie to Mathematica and not a math whiz, but the 
results I got from the following two equations seems like bugs to me.

Test 1:
Running: Simplify[Sin(a) - Sin(b)]
Yeilds: (a - b)Sin

Looks like it's treating the function "Sin" like a coefficient

Test 2:
Running: Simplify[d/s + Cos(2*¹*v/s) - Cos(2*¹*(v - 1)/s)]
Yeilds: (d + 2 Cos ¹) / s

Mathematica completely factors out the variable "v" which is critical 
to the correct solution.

Are these bugs or am I making an inadvertent syntax error.

Thanks,

Ken Tozier

• Follow-Ups:
  • Re: Simplify[expr] bug?
    • From: yehuda ben-shimol <benshimo@bgu.ac.il>
  • Re: Simplify[expr] bug?
    • From: Murray Eisenberg <murray@math.umass.edu>
  • Re: Simplify[expr] bug?
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>