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I : The range of the function f(x)=cos[x...

I : The range of the function `f(x)=cos[x]" for "-pi//2 lt x lt pi//2` is `{1, cos 1, cos 2}`.
II. Every periodic function is one one.

A

only I is true

B

only II is true

C

both I and II are true

D

neither I nor II are true

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