问题标题:
【高一数学题求教,要过程.sin^(π/11)+sin^(9π/22)=】
问题描述:
高一数学题求教,要过程.sin^(π/11)+sin^(9π/22)=
姜旭辉回答:
sin^(π/11)+sin^(9π/22)
=sin^(π/11)+sin^(11π/22-2π/22)
=sin^(π/11)+sin^(π/2-π/11)
=sin^(π/11)+cos^(π/11)
=1
完毕,请批评指正.
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