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[" (A) "f^(-1)(x)=x,x in N],[" (C) "f^(-...

[" (A) "f^(-1)(x)=x,x in N],[" (C) "f^(-1)(x)=x,x in N],[tan((pi)/(4)+(1)/(2)cos^(-1)x)+tan((pi)/(4)-(1)/(2)cos^(-1)x),x!=0" is equal to "],[tan((pi)/(4)+(1)/(2)cos^(-1)x)],[[" (A) "x," (B) "2x]],[[" (A) "x," (B) "2x," (C) "(2)/(x)," (D) "(x)/(2)]]

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