MathGroup Archive 2008

[Date Index] [Thread Index] [Author Index]

Search the Archive

conversion of sin to cos

  • To: mathgroup at
  • Subject: [mg87058] conversion of sin to cos
  • From: glenn077 at
  • Date: Sun, 30 Mar 2008 01:18:07 -0500 (EST)

Hello all,

Here is my problem. I have a very long product of cosines with
arguments of the form k*Pi, k being integers.
I want to convert this expression to a sum of cosines. TrigReduce
works fine, except that it converts cos to sin.
So, I want all the sin (after the TrigReduce) to be converted to cos
and the arguments be of the form p*Pi, p being rational of course.
It has something to do with Hold or HoldAll, but I don't know the
details. Or perhaps the TrigReduce can be overridden
Can someone help?
Thank's for your time.

  • Prev by Date: Re: Number of monomials
  • Next by Date: Re: symbolic evaluation
  • Previous by thread: Re: Number of monominals
  • Next by thread: Re: conversion of sin to cos