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