﹣sin347°×cos32°×cos58°×sin77°
=sin13°×sin77°×cos32°×cos58°
=sin13°×cos13°×cos32°×sin32°
=(sin26°)/2*(sin64°)/2
=(sin26°sin64°)/4
=(sin26°cos26°)/4
=(sin52°)/8
﹣sin347°×cos32°×cos58°×sin77°＝
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