sin(-α-π)=?cos(-α-π)=?tan(-α-π)=?
发布网友
发布时间:2024-09-30 04:39
我来回答
共2个回答
热心网友
时间:2024-12-02 11:41
sin(-α-π)=sin[2π+(-α-π)]=sin(π-α)=sinα
cos(-α-π)=cos[2π+(-α-π)]=cos(π-α)==-cosα
tan(-α-π)=tan[π+(-α-π)]=tan(-α)=-tanα
热心网友
时间:2024-12-02 11:42
sin(-α-π)=-sin(α+π)=sinα
cos(-α-π)=cos(α+π)=-cosα
tan(-α-π)=sin(-α-π)/cos(-α-π)=-tanα