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= 2 cos 80 derajat+40 derajat/2 sin 80 derajat - 40 derajat/2
= 2 cos 120 derajat/2 sin (40 derajat/2
= 2 cos 60 derajat sin 40 derajat/2
= 2 x 1/2 x sin 20 derajat
= sin 20 derajat