sinπ/12 - (√3)cos π/12等于多少请写出详细的过程谢谢大家了

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sinπ/12 - (√3)cos π/12等于多少请写出详细的过程谢谢大家了
sinπ/12 - (√3)cos π/12等于多少
请写出详细的过程谢谢大家了

sinπ/12 - (√3)cos π/12等于多少请写出详细的过程谢谢大家了
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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