At 10:45 AM 1/17/00 +0100, Reinhard Schaeck wrote:
>I want to solve the equation:
>
>COS(2·x) - 2·COS(x) = 0
>
>algebraically and don't know how. "Solve" doesn't do anything.
>--
>
>Reinhard Schaeck
>
SOLVE doesn't do anything? Try again after inserting the line
Trigonometry := Expand
Now, SOLVE even does a little bit too much to my taste. Anyway, by taking
the first two solutions and adding 2*k*pi manually, where k is any positive
integer, you will get all real solutions in DfW 4.11.
Cheers, Johann
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