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sin 15 derajad +cos 105 derajad-2 sin 37derajad+cos 60 derajad+2cos 53 derajad adlh
= sin 15 - cos 75 - 2 sin 37 + 2cos 53 + cos 60
= sin 15 - sin 15 - 2(sin 37 - cos 53) + cos 60
= -2 (sin 37 - sin 37) + 1/2
= -2 (0) + 1/2
= 1/2