Solve the following system of equation by using matlab: 3 x + 5 y + 3 z = 12 2 x + 5 y ? 2 z = 6 3 x + 6 y + 3 z = 3 2) find the root of the following equation by using matlab, error < 0.01: cos(x)= x^3 3) if y=sin(x) + exp(x^2) , integrate y from x=0 to x=1, by using matlab, error < 0.01. 4) caculate exp(3.1) by using taylor expansion and matlab, error < 0.01, at exp(3.0) .