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Verified answer
No.1sinx + √3 cosx = 0
sinx = - √3 cosx
sinx / cosx = - √3
tanx = - √3
x = -60° + k.180
x = 120° , 300° , 480°, ...
No.2
tan3x = -√3
3x = -60° + k.180
x = -20° + k.60°
x = 40° , 100° , 160° , 220° , 280° , 340°
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