tan 210° + sin(300°) + cos(-120°) = ?
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tan210° + sin 300° + cos(-120°)
= tan 210° + sin 300° + cos 120° ( cos (-A) = cosA)
= tan (180+30) + sin(360-60) + cos(180-60)
= tan 30 - sin 60 - cos 60
= 1/√3 - √3/2 - 1/2
= (2 - 3 - √3)/2√3
= - (1 + √3)/2√3
= - (√3 + 3)/6
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