sin347ºcos148º+sin77ºcos58º化简要过程
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![sin347ºcos148º+sin77ºcos58º化简要过程](/uploads/image/z/2555403-51-3.jpg?t=sin347%26%23186%3Bcos148%26%23186%3B%2Bsin77%26%23186%3Bcos58%26%23186%3B%E5%8C%96%E7%AE%80%E8%A6%81%E8%BF%87%E7%A8%8B)
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sin347ºcos148º+sin77ºcos58º化简要过程
sin347ºcos148º+sin77ºcos58º化简要过程
sin347ºcos148º+sin77ºcos58º化简要过程
sin347ºcos148º+sin77ºcos58º
=sin(360º-13º)cos(180º-32º)+sin(90º-13º)cos(90º-32º)
=-sin13º•(-cos32º)+cos13ºsin32º
=sin13ºcos32º+cos13ºsin32º
=sin(13º+32º)
=sin45º=√2/2
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