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sin 130 - ( 2 cos 1/2 (120) . sin 1/2 (100))
sin 130 - ( 2 cos 60 . sin 50 )
sin 130 - ( 2 . 1/2 . sin 50 )
sin 130 - sin 50
sin (180-50) - sin 50
sin 50 - sin 50 = 0