(1/2)三角形ABC的对边为abc,且sin(派4+A)=7根号2/10(0

问题描述:

(1/2)三角形ABC的对边为abc,且sin(派4+A)=7根号2/10(0

(1/2)三角形ABC的对边为abc,且sin(派4+A)=7根号2/10(0