计算:sin(-120°)tan(-120°) cos(-135°)cot420° sin270°
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计算:sin(-120°)tan(-120°) cos(-135°)cot420° sin270°
![计算:sin(-120°)tan(-120°) cos(-135°)cot420° sin270°](/uploads/image/z/19484254-46-4.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9Asin%28-120%C2%B0%EF%BC%89tan%28-120%C2%B0%29+cos%28-135%C2%B0%29cot420%C2%B0+sin270%C2%B0)
sin(-120°)=-sin120°=-sin(180°-60°)=-sin60°=-√3/2
tan(-120)=-tan120=-tan(180-60)=-(-tan60)=tan60=√3
cos(-135)=cos135=cos(90+45)=-cos45=-√2/2
cot420=cot(360+60)=cot60=√3/3
sin270=sin(360-90)=sin(-90)=-sin90=-1
tan(-120)=-tan120=-tan(180-60)=-(-tan60)=tan60=√3
cos(-135)=cos135=cos(90+45)=-cos45=-√2/2
cot420=cot(360+60)=cot60=√3/3
sin270=sin(360-90)=sin(-90)=-sin90=-1
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