作业帮化简 sin(x-20°)+cos(x+70°)+sin(x+20°)sec(70°-x)麻烦稍微写下过程呐.
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/24 06:28:33
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化简 sin(x-20°)+cos(x+70°)+sin(x+20°)sec(70°-x)麻烦稍微写下过程呐.
化简 sin(x-20°)+cos(x+70°)+sin(x+20°)sec(70°-x)
麻烦稍微写下过程呐.
化简 sin(x-20°)+cos(x+70°)+sin(x+20°)sec(70°-x)麻烦稍微写下过程呐.
sin(x-20)=sin(110-x)
cos(x+70)=-cos(110-x)
sin(x+20)=cos(70-x)
sec(70-x)=1/cos(70-x)
原式=sin(110-x))-cos(110-x)+cos(70-x)*1/cos(70-x)=2^0.5sin(65-x)+1
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化简sin(x-25°)sin(65°-x)+cos(x-25°)cos(65°-x)的结果为