根号3倍的余弦12分之派减去正弦12分之派等于多少？
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根3cosπ/12-sinπ/12
=2×[(根3/2)cosπ/12-(1/2)sinπ/12]
=2×[sinπ/3cosπ/12-sinπ/12cosπ/3]
=2×[sin(π/3-π/12)]
=2sin(π/4)
=根2
=2×[(根3/2)cosπ/12-(1/2)sinπ/12]
=2×[sinπ/3cosπ/12-sinπ/12cosπ/3]
=2×[sin(π/3-π/12)]
=2sin(π/4)
=根2
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