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Trigonometric simplification

• To: mathgroup at smc.vnet.net
• Subject: [mg68838] Trigonometric simplification
• From: carlos at colorado.edu
• Date: Mon, 21 Aug 2006 03:27:32 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

As an intermediate result of some calculations I have
the expression

   r=Tan[a]^2/(Sec[a]^2)^(3/2)

where a is real. How can I coerce Mathematica into
simplifying that to

   r=Cos[a]*Sin[a]^2

Both Simplify and FullSimplify with assumptions on a
fail to get the simpler form.

• Follow-Ups:
  • Re: Trigonometric simplification
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>