计算:cos13°×cos47°+sin13°×cos137°,
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计算:cos13°×cos47°+sin13°×cos137°,计算:cos13°×cos47°+sin13°×cos137°,计算:cos13°×cos47°+sin13°×cos137°,cos1
计算:cos13°×cos47°+sin13°×cos137°,
计算:cos13°×cos47°+sin13°×cos137°,
计算:cos13°×cos47°+sin13°×cos137°,
cos137°=cos(90°+43°)=cos90°cos43°-sin90°sin43°=0-sin43°=-sin43°
cos13°×cos47°+sin13°×cos137°
=cos13°×cos47°-sin13°×sin47°
=cos(13°+47°)
=cos60°
=0.5
cos13×cos47-sin13×sin47=cos(13+47)=cos60=1/2
计算:cos13°×cos47°+sin13°×cos137°,
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