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Help needed in Mathematica
*To*: mathgroup at yoda.physics.unc.edu
*Subject*: Help needed in Mathematica
*From*: Steve Xing Gu <sgu at henry.eecs.berkeley.edu>
*Date*: Thu, 23 Jun 1994 22:43:23 -0700
I recently encountered a problem which I cannot solve sucessfully by
Mathematica functions. I have a transcedental function in the form(A) of
C1 Cos[X] + C2 Sin[X], and I want to use one function to convert form(A) to
the form(B), C3 Cos[X + Y].
Converting from form(B) to form(A) can be easily done by the function,
"TrigReduce" in "Algebra`Trigonometry`", as the example shown below:
***************************************************************************
In[84]:=
N[Expand[TrigReduce[5.64 Cos[t + 3 Pi / 4]]]]
Out[84]=
-3.98808 Cos[t] - 3.98808 Sin[t]
***************************************************************************
But I've been unsucessfuly in converting from -4 Cos[t] - 4 Sin[t] to
5.64 Cos[t + 3 Pi / 4].
Handling transcedental functions is one of the weak parts of Mathematica.
I appreciate any assistance on this problem.
Steve Gu
sgu at ohm.eecs.berkeley.edu
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