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2. cos 360 - alfa = cos alfa
3. tan 360- alfa= -tan alfa penjelasan nomer 1
= sin 360 cos (-α) + cos 360 sin (-α)
= sin 360 cos α - cos 360 sin α
= -sin α
2. cos (360 - α)° = cos {360 + (-α) }
= cos 360 cos (-α) - sin 360 sin (-α)
= cos 360 cos α - sin 360 (-sin α)
= cos α
3. tan (360 - α)° = tan { 360 + (-α) }
= tan 360 + tan (-α)
1 - tan 360 tan (-α)
= tan 360 - tan α
1 + tan 360 tan α
= -tan α