sin20º﹡sin40º﹡sin60º﹡sin80º=?
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![sin20º﹡sin40º﹡sin60º﹡sin80º=?](/uploads/image/z/1606646-38-6.jpg?t=sin20%26%23186%3B%EF%B9%A1sin40%26%23186%3B%EF%B9%A1sin60%26%23186%3B%EF%B9%A1sin80%26%23186%3B%3D%3F)
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sin20º﹡sin40º﹡sin60º﹡sin80º=?
sin20º﹡sin40º﹡sin60º﹡sin80º=?
sin20º﹡sin40º﹡sin60º﹡sin80º=?
见图