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38. Let/(x)=sin'. + cos" ec x -tan x.The...

38. Let/(x)=sin'. + cos" ec x -tan x.The two functions g ( x ) = sec x tan are equal over the set 1) φ 2) R 3pR フtx|x=(2n + 1 )뜰.neZ} 4)R-{아 2

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