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教育/科学

求值sin50(1+√3tan10)

2008-06-22 10:39:27l***
求值 sin50(1+√3tan10)求值sin50(1+√3tan10)：sin50(1+√3tan10)=sin50(1+tan(60)tan10))=sin50(1+sin(60)sin10)?

最佳回答

  • sin50(1+√3tan10)=sin50(1+tan(60)tan10))=sin50(1+sin(60)sin10)/[cos(60)cos(10])=sin(50)[sin60sin10+cos60cos10]/[cos60cos10]=sin(50)cos(60-10)/[cos(60)cos(10)]=sin(50)cos(50)/[cos(60)cos(10)]=sin(100)/[2cos(60)cos(10)]=sin(100)/cos(10)=cos(10)/cos(10)=1
    2008-06-22 10:44:52
    • 很赞哦！ (26)

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