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cos 270° = cos(180 + 90)°
cos 270° = -cos 90°
cos 270° = -0 = 0
cos 135° = cos(180 - 45)°
cos 135° = -cos 45°
cos 135° = -1/2 √2
tan 135° = tan(180 - 45)°
tan 135° = -tan 45° = -1
sin 150° = sin(180 - 30)°
sin 150° = sin 30° = 1/2
cos 225° = cos(180 + 45)°
cos 225° = -cos 45°
cos 225 = -1/2 √2
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