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If f(x)=cos^2x+sec^2x, then (a) f(x) < 1...

If `f(x)=cos^2x+sec^2x,` then (a) `f(x) < 1` (b) `f(x)=1` (c) `2 < f(x) < 1` (d) `f(x) >= 2`

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