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bb"Statement I" The range of f(x)=sin(...

`bb"Statement I"` The range of
`f(x)=sin(pi/5+x)-sin(pi/5-x)-sin((2pi)/5+x)+sin((2pi)/5-x)` is [-1,1].
`bb"Statement II " cos""pi/5-cos""(2pi)/5=1/2`

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