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y=sin(x+π/6)sin(x-π/6)的最小周期是
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y=sin(x+π /6)sin(x-π/6)的最小周期是
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积化和差
y=sin(x+π/6)sin(x-π/6)
=[cos(x+π/6-x+π/6)-cos(x+π/6+x-π/6)]/2
=[cos(π/3)-cos(2x)]/2
=1/4-cos2x/2
故T=2π/2=π
如果不懂,请Hi我,祝学习愉快!
y=sin(x+π/6)sin(x-π/6)
=[cos(x+π/6-x+π/6)-cos(x+π/6+x-π/6)]/2
=[cos(π/3)-cos(2x)]/2
=1/4-cos2x/2
故T=2π/2=π
如果不懂,请Hi我,祝学习愉快!
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