化简cos(π/12)*cos(5π/12)
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化简cos(π/12)*cos(5π/12)
化简cos(π/12)*cos(5π/12)
化简cos(π/12)*cos(5π/12)
cos(π/12)*cos(5π/12)
=cos(π/12)*cos(π/2-π/12)
=cos(π/12)*sin(π/12)
=(1/2)*sin(π/6)
=(1/2)*(1/2)
=1/4
化简cos(π/12)*cos(5π/12)
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cosπ/12=
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