根号3×cosπ/12-sinπ/12=?
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根号3×cosπ/12-sinπ/12=?根号3×cosπ/12-sinπ/12=?根号3×cosπ/12-sinπ/12=?根号3×cosπ/12-sinπ/12=2(根号三/2cosπ/12-1/
根号3×cosπ/12-sinπ/12=?
根号3×cosπ/12-sinπ/12=?
根号3×cosπ/12-sinπ/12=?
根号3×cosπ/12-sinπ/12=2(根号三/2cosπ/12-1/2sinπ/12)
=2(sinπ/3cosπ/12-cosπ/3sinπ/12)
=2sin(π/3-π/12)= 根号2
=V(3+1)(V3/2 Cos pi/12 - 1/2 sin Pi/12)
=2Sin( pi/3 - pi/12)
=2Sin(pi/4)
=V2