3. Compute the line integrals S P dx + Q dy where: (a) y is the straight line segment from 1 to i, P(z) = z and Q(z) = iz. (b) y is the straight line segment from 1 to i, P(z) = z and Q(z) = -iz. y (c) is the quarter-circle centered at 0 from 1 to i, P(z) = z and Q(z) = iz. (d) y is the quarter-circle centered at 0 from 1 to i, P(z) = z and Q(z) = iz. [You may re-use calculations between parts of the question without repeating them.]