Answer to Question #34945 in Linear Algebra for ric

Question

can u please help me solve this equation. i have the answer in my book but can u help me solve it
i have a 3x3 matrix
1=p(1,1) + p(2,1)*e^ix + p(3,1)*e^-ix
cos x = p(2,1) + p(2,2)*e^ix +p(3,2)*e^-ix
sin x= p(1,3) +p(2,3)*e^ix + p(3,3)*e^-ix
where p is a 3 by 3 matrix