已知函数. （Ⅰ）求函数的单调增区间；（Ⅱ）在中，分别是角的对

已知函数.

（Ⅰ）求函数的单调增区间；

（Ⅱ）在中，分别是角的对边，且，求的面积.

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已知函数. （Ⅰ）求函数的单调增区间； （Ⅱ）在中，分别是角的对

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已知函数. （Ⅰ）求函数的单调增区间；（Ⅱ）在中，分别是角的对