Re: Trigonometric simplification

*To*: mathgroup at smc.vnet.net*Subject*: [mg68957] Re: Trigonometric simplification*From*: Peter Pein <petsie at dordos.net>*Date*: Fri, 25 Aug 2006 05:35:18 -0400 (EDT)*References*: <ecbnnc$r29$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

carlos at colorado.edu schrieb: > 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. > At least FullSimplify doesn't: In[1]:= FullSimplify[Tan[a]^2/(Sec[a]^2)^(3/2), -Pi < 2*a < Pi] Out[1]= Cos[a]*Sin[a]^2