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[tan((pi)/(4)+(1)/(2)cos^(-1)x)+tan((pi)...

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

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