sin(10°)+sin(50°)-sin(70°) =
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sin(10°)+sin(50°)-sin(70°) =
sin(10°)+sin(50°)-sin(70°) =
sin(10°)+sin(50°)-sin(70°) =
![sin(10°)+sin(50°)-sin(70°) =](/uploads/image/z/16197182-62-2.jpg?t=sin%2810%C2%B0%29%2Bsin%2850%C2%B0%29-sin%2870%C2%B0%29+%3D)
![](http://img.wesiedu.com/upload/2/99/299b3e9a90be272c8d28ada64a9923ba.jpg)
计算:sin方10°+sin方20°+sin方30°+sin方40°+sin方50°+sin方60°+sin方70°+s
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