(sin24°cos6°-sin66°sin6°)/(sin21°cos39°-cos21°sin39°)

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/29 17:14:55
(sin24°cos6°-sin66°sin6°)/(sin21°cos39°-cos21°sin39°)

(sin24°cos6°-sin66°sin6°)/(sin21°cos39°-cos21°sin39°)
(sin24°cos6°-sin66°sin6°)/(sin21°cos39°-cos21°sin39°)

(sin24°cos6°-sin66°sin6°)/(sin21°cos39°-cos21°sin39°)
(sin24°cos6°-sin66°sin6°)/(sin21°cos39°-cos21°sin39°)
=(sin24°cos6°-cos24°sin6°)/(sin21°cos39°-cos21°sin39°)
=sin(24°-6°)/sin(21°-39°)
=sin18°/sin(-18°)
=-sin18°/sin18°
=-1