化简1+sin(α-2π)sin(π+α)-2cos(-α)
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/08/10 11:28:43
化简1+sin(α-2π)sin(π+α)-2cos(-α)
![化简1+sin(α-2π)sin(π+α)-2cos(-α)](/uploads/image/z/20074243-67-3.jpg?t=%E5%8C%96%E7%AE%801%2Bsin%28%CE%B1-2%CF%80%29sin%28%CF%80%2B%CE%B1%29-2cos%28-%CE%B1%29)
1+sin(α-2π)sin(π+α)-2cos(-α) =1+sina*(-sina)-2(cosa)^2 =1-(sina)^2-2(cosa)^2 =-(cosa)^2
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