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cos 315 = (1/2)√2
tan 315 = -1
2. sin 360 = 0
cos 360 = 1
tan 360 = 0
3. sin - 30 = -1/2
cos -30 = (1/2)√3
tan - 30 = -(1/3)√3
4. sin - 120 = -(1/2)√3
cos - 120 = - 1/2
tan -120 = √3
5. sin - 225 = (1/2)√2
cos - 225 = - (1/2)√2
tan - 225 = -1