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=2 [sin 90+sin 60]
=2 (1+1/2 v3)
cos 135 = -1/2 v2
jadi
4sin75cos15.cos135 =2(1+1/2v3).(-1/2v2)
=(2+v3)(-1/2)(v2)
=-1/2(2+v3)(v2)