已知sin(7/12π+α)=2/3,求cos(α-11/12π)的值 谢谢老师回答
人气：270 ℃ 时间：2020-04-14 22:46:07
解答
sin(7/12π+α)=2/3
α=arcsin(2/3)-7/12π
cos(α-11/12π)
=cos(arcsin(2/3)-7/12π-11/12π)
=cos(arcsin(2/3)-18/12π)
=cos(arcsin(2/3)-3/2π)
=-2/3
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