Basic operations in Matlab

1. Matlab as a calculator

   pi*pi -10
   sin(pi/4)
   ans^2    %what value does and hold?
   who %what do you get?
   x=4
   who %and now?
   zz=3+4i
   conj(zz)
   abs(zz)
   angle(zz)
   real(zz)
   imag(zz) %what do conj, abs, angle. real represent?