sin 11π/12等于多少
问题描述：
sin 11π/12等于多少
答
sin 11π/12=sin(π-1/12π)
=sin(π/12)
=sin(π/3-π/4)
= sinπ/3 cosπ/4 - sinπ/4 cosπ/3
= √3/2 * √2/2 - √2/2 * 1/2
= （√6-√2)/4