sin180/16*cos180/16*cos180/8*cos180/4 =1/2*(2sin180/16*cos180/16)*cos180/8*cos180/4 =1/2*sin180/8*cos180/8*cos180/4 =1/2*1/2*(2sin180/8*cos180/8)*cos180/4 =1/4*sin180/4*cos180/4 =1/4*1/2*(2sin180/4*co...