Let fequalsleft angle 2 xy plus z squared comma x squared plus yz comma 2 xz plus startfraction y squared over 2 endfraction right angle and let c be the circle r(t)equalsleft angle 6 sine t comma 4 sine t comma 3 cosine t right angle, for 0less than or equalstless than or equals2pi. evaluate modifyingbelow contour integral with upper c bold upper f times d bold r using any method.