(本小题满分13分) 已知函数.（1）若，且为第一象限角，求y的值；（2）若，求y的值．

题型：解答题难度：简单来源：不详

(本小题满分13分) 已知函数.
（1）若，且为第一象限角，求y的值；
（2）若，求y的值．

答案

解：(1) x为第一象限角， 
∴，代入函数·············································································· 3分
···································································· 6分
(2) ········································ 10分
∵     ∴························································ 13分

解析

略