Complete the sentence below. If P is a point with polar coordinates \left(r,\theta\right)( r , θ ), the rectangular coordinates \left(x, y\right)( x , y ) of P are given by [ Select ] (a) x=rsin\:\theta,\:y=rcos\thetax = r s i n θ , y = r c o s θ (b) x=rcos\theta,\:y=rsin\thetax = r c o s θ , y = r s i n θ (c) x=rcos\theta,\:y=rcos\thetax = r c o s θ , y = r c o s θ (d) x=rsin\theta,\:y=rsin\theta