pls solve these questions

[1 2 3]
[1 3 5] find the trace of the matrix
[1 5 12]


(B) Let g(x)= (5-x)/(1+x^2)(1-x) express it in partial fractions


determine the value of a,b,c and d when g(x) is expressed as a series in descending powers of x in the form of

g(x)=a+bx+c(x^2)+d(x^3)+..................

pls reply here and also send answers to [email protected]
i bneed the answers for my project.