求值:sin29π|9cos4π|9+sin41π|18cos19π|18哥哥,姐姐们帮帮小弟……
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求值:sin29π|9cos4π|9+sin41π|18cos19π|18哥哥,姐姐们帮帮小弟……
(3)sin29π/9cos4π/9+sin41π/18cos19π/18
(3)sin29π/9cos4π/9+sin41π/18cos19π/18
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