# Can anyone help with a linear alg problem

• Feb 23rd 2009, 02:48 PM
yybn
Can anyone help with a linear alg problem
The problem is in the attachment. (a matrix involve trigonometry). I wonder if anybody can help!

yybn(Crying)
• Feb 23rd 2009, 04:11 PM
Plato
Look at the case where $\theta _1 = 0\;\& \,\theta _2 = \frac{\pi }{2}$
• Feb 23rd 2009, 04:58 PM
yybn
Thanks Plato
Thanks! Plato(Hi)

This sounds a very good idea to start. But could you give me a more general proof? ( the formula to be used are:
sin(X+Y)= sin (X)cos(Y)+cos(X)sin (Y)
cos(X+Y)=cos(X)cos(Y)-sin(X)sin(Y)

Thanks a lot!

yybn