题目内容
(本小题满分12分)
已知
.
(1)求
的值;
(2)求
的值.
已知

(1)求

(2)求

(1)
(2)


(1)由
,
, ………………………2分
. …………………5分
(2
)原式=

…………………10分

. …………………12分
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(2
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