(cos12分之派减sin12分之派)(COS12分之%+sin12分之派)的植为多少
问题描述:
(cos12分之派减sin12分之派)(COS12分之%+sin12分之派)的植为多少
答
原式=cos²π/12-sin²π/12
=cos(2×π/12)
=cosπ/6
=√3/2