化简:sin43°-sin13°cos30°/cos13°

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/20 19:23:45
化简:sin43°-sin13°cos30°/cos13°
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化简:sin43°-sin13°cos30°/cos13°
化简:sin43°-sin13°cos30°/cos13°

化简:sin43°-sin13°cos30°/cos13°
原式=[sin(30°+13°)-sin13°cos30°]/cos13°
=(sin30°cos13°+cos30°sin13°-sin13°cos30°)/cos13°
=sin30°cos13°/cos13°
=sin30°
=1/2