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[" For a positive integer "n," let "],[[...

[" For a positive integer "n," let "],[[f_(n)(theta)=tan(theta/2)(1+sec theta)(1+se],[" then "],[" (A) "f_(2)(pi/16)=1],[" (B) "f_(3)(pi/32)=1],[" (c) "f_(4)(pi/64)=1],[" (D) "f_(5)(pi/128)=1]]

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