在锐角中,分别是角的对边,,. (1)求的值;      (2)若,求的面积.

在锐角中,分别是角的对边,,.

(1)求的值;      (2)若,求的面积.

答案

解:(1),又为锐角,

     ,又为锐角,

。…6分

(2)由正弦定理得.

由(1)知,, .

.            ……12分

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