hi sorry about this but i cant remeber how to convert these.

how does this :

1.5, -60degrees +2.3, -18degrees

become:

(0.75 -j1.3) +( 2.19 -j0.71)?

i know you do 1.5 x cos -60 = 0.75 and cos 2.3 x -18 = 2.19 but how do i get the j numbers?

any help appreciated hope i posted it correctly!