cos 330° = cos (360 - 30)° = cos 30° = (1/2)√3
cot 120° = cot (90 + 30)° = - tan 30° = (1/3)√3
cos - 45° = cos 45° = (1/2)√2
sin 120° + cos 210° - tan 225°
= sin (90+30)° + cos (180+30)° - tan (180+45)°
= cos 30° + - cos 30° - - tan 45°
= tan 45°
= 1
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cos 330° = cos (360 - 30)° = cos 30° = (1/2)√3
cot 120° = cot (90 + 30)° = - tan 30° = (1/3)√3
cos - 45° = cos 45° = (1/2)√2
sin 120° + cos 210° - tan 225°
= sin (90+30)° + cos (180+30)° - tan (180+45)°
= cos 30° + - cos 30° - - tan 45°
= tan 45°
= 1