sin3x、cos3x等于好多?
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/13 07:02:02
sin3x、cos3x等于好多?
sin3a=3sina-4sin³a
cos3a =4cos³a-3cosa
推导方法如下:
sin3a
=sin(2a+a)
=sin2a×cosa+cos2a×sina
=2×sina×cosa×cosa+(1-2sin²a)×sina
=2sina×(1-sin²a)+(1-2sin²a)×sina
=2sina×(1-sin²a)+(1-2sin²a)×sina
=2sina-2sin³a+sina-2sin³a
=3sina-4sin³a
cos3a
=cos(2a+a)
=cos2a×cosa-sin2a×sina
=(2cos²a-1)×cosa-2×sina×cosa×sina
=(2cos²a-1)×cosa-2(sin²a)×cosa
=(2cos²a-1)cosa-2(1-cos²a)cosa
=2cos³a-cosa-2cosa+2cos³a
=4cos³a-3cosa
cos3a =4cos³a-3cosa
推导方法如下:
sin3a
=sin(2a+a)
=sin2a×cosa+cos2a×sina
=2×sina×cosa×cosa+(1-2sin²a)×sina
=2sina×(1-sin²a)+(1-2sin²a)×sina
=2sina×(1-sin²a)+(1-2sin²a)×sina
=2sina-2sin³a+sina-2sin³a
=3sina-4sin³a
cos3a
=cos(2a+a)
=cos2a×cosa-sin2a×sina
=(2cos²a-1)×cosa-2×sina×cosa×sina
=(2cos²a-1)×cosa-2(sin²a)×cosa
=(2cos²a-1)cosa-2(1-cos²a)cosa
=2cos³a-cosa-2cosa+2cos³a
=4cos³a-3cosa
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