题目内容
(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．
.（1）若
，且为第一象限角，求y的值；（2）若
，求y的值．解：(1) x为第一象限角，
∴
，代入函数·············································································· 3分
···································································· 6分
(2)
········································ 10分
∵ ∴
························································ 13分
∴
，代入函数·············································································· 3分···································································· 6分(2)
········································ 10分∵
∴························································ 13分略
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