在

中,角

所對的邊分別為

,已知

,

, 且

.\
(Ⅰ)求角

的大小;
(Ⅱ)設(shè)

,且

的最小正周期為

,求

在

上的最大值.
(Ⅰ)由

得

,
則
由正弦定理得

………………3分
即

∵

是

的內(nèi)角 ∴

………………6分
(Ⅱ)

∵

的最小正周期為

∴
∴

………………9分
∴

∵


∴

∴當

即

時,

的最大值為

…………12分
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
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
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
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
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
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
,

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
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
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
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
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
中的任意兩個元素,且|

|的最

小值為

。
(I)求

,
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
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