设锐角三角形ABC内角A,B,C对边为a,b,c,a=2bsinA。 (1)求B大小; (2)求cosA+sinC的取值范围。

作者: tihaiku 人气: - 评论: 0
问题 设锐角三角形ABC内角A,B,C对边为a,b,c,a=2bsinA。 (1)求B大小; (2)求cosA+sinC的取值范围。
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相关内容:锐角,三角形,内角,2bsinA,大小,cosA+sinC,范围

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