题目内容
化简下列各式
(1)cos(80°+3α)cos(35°+3α)+sin(80°+3α)cos(55°-3α);
(2)sin(x+
)+2sin(x-
)-
cos(
-x);
(3)
.
答案:
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题目内容
化简下列各式
(1)cos(80°+3α)cos(35°+3α)+sin(80°+3α)cos(55°-3α);
(2)sin(x+
)+2sin(x-
)-
cos(
-x);
(3)
.