Which pair of equations can be used to verify the rectangular form. z=a+bi i, and the polar form of a complex number are equivalent?
A) a=sin (θ ) and b=cos (θ )
B) a=cos (θ ) and b=sin (θ )
C) a=rsin (θ ) and b=rcos (θ )
D) a=rcos (θ ) and b=rsin (θ )
