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Simplify Trig expressions

  • To: mathgroup at
  • Subject: [mg12821] Simplify Trig expressions
  • From: Tobias Oed <tobias at>
  • Date: Fri, 12 Jun 1998 04:05:50 -0400
  • Organization: Old Dominion University
  • Sender: owner-wri-mathgroup at

Hi to all!
Does anyone know why

In[1]:= a=Factor[Cos[b]^2-1]

Out[1]= (-1 + Cos[b]) (1 + Cos[b])

In[2]:= FullSimplify[a] // InputForm

Out[2]//InputForm= -Sin[b]^2

In[3]:= FullSimplify[3 a] // InputForm

Out[3]//InputForm= -3*Sin[b]^2

In[4]:= FullSimplify[c a] //InputForm

Out[4]//InputForm= c*(-1 + Cos[b])*(1 + Cos[b])

fails in the last case ?
(using Math ver 3.0 for HP-UX PA-RISC)

any idea ?
Cheers Tobias

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