已知向量m=(sinB,1-cosB),且与向量n=(1,0)所成的角为60°,其中A、B、C是△ABC的内角.(知向量m=(sinB,1-cosB),且与向量n=(1,0)所成的角为60°,其中A、B、C是△ABC的内角.(1)求角B的大小(2) 若sinA+sinC=
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![已知向量m=(sinB,1-cosB),且与向量n=(1,0)所成的角为60°,其中A、B、C是△ABC的内角.(知向量m=(sinB,1-cosB),且与向量n=(1,0)所成的角为60°,其中A、B、C是△ABC的内角.(1)求角B的大小(2) 若sinA+sinC=](/uploads/image/z/5242721-41-1.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fm%3D%EF%BC%88sinB%2C1-cosB%29%2C%E4%B8%94%E4%B8%8E%E5%90%91%E9%87%8Fn%3D%281%2C0%29%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92%E4%B8%BA60%C2%B0%2C%E5%85%B6%E4%B8%ADA%E3%80%81B%E3%80%81C%E6%98%AF%E2%96%B3ABC%E7%9A%84%E5%86%85%E8%A7%92.%EF%BC%88%E7%9F%A5%E5%90%91%E9%87%8Fm%3D%EF%BC%88sinB%2C1-cosB%29%2C%E4%B8%94%E4%B8%8E%E5%90%91%E9%87%8Fn%3D%281%2C0%29%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92%E4%B8%BA60%C2%B0%2C%E5%85%B6%E4%B8%ADA%E3%80%81B%E3%80%81C%E6%98%AF%E2%96%B3ABC%E7%9A%84%E5%86%85%E8%A7%92.%EF%BC%881%EF%BC%89%E6%B1%82%E8%A7%92B%E7%9A%84%E5%A4%A7%E5%B0%8F%EF%BC%882%EF%BC%89+%E8%8B%A5sinA%2BsinC%3D)
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