MathGroup Archive 2006

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Trigonometric simplification


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.


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