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bb"Statement I" The period of f(x)=2cos"...

`bb"Statement I"` The period of `f(x)=2cos""1/3(x-pi)+4sin""1/3(x-pi) " is " 3pi`.
`bb"Statement II"` If T is the period of f(x), then the period of f(ax+b) is `T/abs(a)`.

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