The problem is in the attachment. (a matrix involve trigonometry). I wonder if anybody can help! yybn
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Look at the case where $\displaystyle \theta _1 = 0\;\& \,\theta _2 = \frac{\pi }{2}$
Thanks! Plato 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
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