f(x)=2cosxcos(x-180/6)-根号3sin^2x+sinxcosx (180是派来的.我不会打那符号.根
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f(x)=2cosxcos(x-180/6)-根号3sin^2x+sinxcosx (180是派来的.我不会打那符号.根号3的符号我也不会打)
求函数f(x)的最小正周期.把式子化出来.O
求函数f(x)的最小正周期.把式子化出来.O
f(x)=2cosxcos(x-π/6)-根号3sin^2x+sinxcosx
=2cosxcos(x-π/6)-根号3sin^2x+sinxcosx
=2cosx(根号3/2cosx+1/2sinx)-根号3in^2x+sinxcosx
=根号3cos^2x+sinxcosx-根号3sin^2x+sinxcosx
=根号3(cos^2x-sin^2x)+2sinxcosx
=根号3cos2x+sin2x
=2(根号3/2cos2x+1/2sin2x)
=2sin(2x+π/3)
周期为π
=2cosxcos(x-π/6)-根号3sin^2x+sinxcosx
=2cosx(根号3/2cosx+1/2sinx)-根号3in^2x+sinxcosx
=根号3cos^2x+sinxcosx-根号3sin^2x+sinxcosx
=根号3(cos^2x-sin^2x)+2sinxcosx
=根号3cos2x+sin2x
=2(根号3/2cos2x+1/2sin2x)
=2sin(2x+π/3)
周期为π
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