Help on computing matrix with complex numbers and polar form

above is a photo of what I'm trying to solve. I know how to enter in the 4x4 matrix but I don't know how to enter in the 3x1 matrix. Any help would be great and I already know how to compute the answer all I need help with is with the polar form of the matrix. Thanks

[Stephen23]

@David Colorado: I uploaded your screenshot here. Please do not put links to images on third-party websites.

Answer 1

[Walter Roberson]

For a point expressed in length r and angle theta degrees,

Z = r.*( cosd(theta) + 1i.* sind(theta))