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The range of f(x)=sec^(-1)((log)3tanx+(l...

The range of `f(x)=sec^(-1)((log)_3tanx+(log)_(tanx)3)` is (a) `[pi/3,pi/2)uu(pi/2,(2pi)/3]` (b) `[0,pi/2]` (c) `((2pi)/3,pi)` (d) none of these

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