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sin(-x) = -sin x
Sehingga,
sin (-35) = - sin 35
cos 215 = cos(180+35)
cos 215 = - cos 35
csc 970 = csc(720+250)
csc 970 = csc 250
csc 970 = csc(180+70)
csc 970 = -csc 70