Cos(α-π/6)+Sinα=4√3/5,那么Sin(α+7π/6)等于多少?
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Cos(α-π/6)+Sinα=4√3/5,那么Sin(α+7π/6)等于多少?
Cos(α-π/6)+Sinα=4√3/5,那么Sin(α+7π/6)等于多少?
Cos(α-π/6)+Sinα=4√3/5,那么Sin(α+7π/6)等于多少?
cos(α-π/6)+sinα=cosα*√3/2-1/2 *sinα+sinα=cosα*√3/2+1/2 *sinα=sin(α-π/6);
sin(α-7π/6)=-sin(α-7π/6+π)=-sin(α-π/6)=-4√3/5
郁闷,遇到不知真假的提问者
还是将我的正解删除吧
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