µÚI¾í£¨Ñ¡ÔñÌâ ¹²50·Ö£©
Ò»¡¢ Ñ¡ÔñÌ⣺£¨±¾´óÌâ¹²ÓÐ10СÌ⣬ÿСÌâ5·Ö£¬¹²50·Ö£©
1£®ÔÚ¡÷ABCÖУ¬Ò»¶¨³ÉÁ¢µÄµÈʽÊÇ( )
A£®asinA£½bsinB B£®acosA£½bcosB
C£®as inB£½bsinA D£®acosB£½bcosA
2¡¢Å×ÎïÏß µÄ½¹µã×ø±êΪ£¨ £©
A£® B£® C£® D£®
3£®