Subject: A Question about a trigonometric identity
From: Jaime Villate
Date: Tue, 17 Nov 2009 11:19:43 +0000
On Seg, 2009-11-16 at 10:35 -0800, Martin Mallinson wrote:
> My problem of course, is that I had to guess that the expression was a
> simple phase shift, had I not guessed this, I would never have got
> there...
A picture is worth a thousand words:
(%i1) R: (3^(3/2)*sin(z)-3*cos(z))/4$
(%i2) plot2d(R, [z, 0, 3*%pi]);
shows that the function R is a sin function (or a co-sine function
depending on you taste).
Regards,
Jaime