1£®Èô¼¯ºÏA£½{x£üy£½ £­1}£¬B£½{y£üy£½ £­1£¬x∈R}£¬ÔòÓÐ

    A£® A£½B       B£® A∩B£½B       C£® A∩B£½A      D£®A∪B£½R

2£®ÒÑÖª £½2£­i £¨ ÊÇzµÄ¹²éÊý£©£¬Ôò¸´ÊýzÔÚ¸´Æ½ÃæÄÚ¶ÔÓ¦µÄµãλÓÚ

    A£®µÚÒ»ÏóÏÞ     B£®µÚ¶þÏóÏÞ       C£®µÚÈýÏóÏÞ        D£®µÚËÄÏóÏÞ

3£®Èôsinα£½ £¬αÊǵڶþÏóÏ޵Ľǣ¬Ôò cos£¨α£­ £©£½