sinπ/12 - (√3)cos π/12等于多少

1个回答

  • 运用提携公式,提出2

    所以原式变为:2(1/2sinπ/12 - √3/2cos π/12)

    原式:2(1/2sinπ/12 - √3/2cos π/12)

    =2(cosπ/3*sinπ/12 - sinπ/3*cos π/12)

    =2sin(π/12 -π/3)

    =2sin(-π/4)

    =-√2

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