sin 11π/12等于多少

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sin11π/12等于多少sin11π/12等于多少sin11π/12等于多少sin11π/12=sin(π-1/12π)=sin(π/12)=sin(π/3-π/4)=sinπ/3cosπ/4-si

sin 11π/12等于多少
sin 11π/12等于多少

sin 11π/12等于多少
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