• 化简(tan10°-√3)?cos10°sin50°= .试题及答案-填空题-云返教育

    • 试题详情

      化简(tan10°-
      3
      )?
      cos10°
      sin50°
      =         

      试题解答


      -2
      解:∵tan10°-
      3
      =
      sin10°
      cos10°
      -
      3
      =
      sin10°-
      3
      cos10°
      cos10°
      =
      2sin(10°-60°)
      cos10°
      =-
      2sin50°
      cos10°

      ∴(tan10°-
      3
      )?
      cos10°
      sin50°
      =-
      2sin50°
      cos10°
      ?
      cos10°
      sin50°
      =-2
      故答案为:-2
    MBTS ©2010-2016 edu.why8.cn