求函数f(x)=cos^2(x-pai/12)+sin^2(x+pai/12)-1的周期
教我一下过程,高一的基本忘了,公式最好也列出来!
谢谢了,各位大虾!
人气:353 ℃ 时间:2019-08-18 05:49:05
解答
cos²x=(1+cos2x)/2sin²x=(1-cos2x)/2所以f(x)=[1+cos(2x-π/6)]/2+[1-cos(2x+π/6)]/2-1=1/2[cos(2x-π/6)-cos(2x+π/6)]=1/2[(cos2xcosπ/6+sin2xsinπ/6)-(cos2xcosπ/6-sin2xsinπ/6)]=sin2xsinπ/6=(1...
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