Write a user-defined SCILAB function for the following function r = - 1 + Sin (Theta) The input to the function is Theta (in radians) and the output is r. Write the function such that Theta can be a vector. a. Use the function to calculate r (pi/3) and r(3 pi/2). b Use the function to plot (polarplot r (Theta) for 0 lessthanorequalto Theta lessthanorequalto 2 pi