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[" If "cot(2x)/(3)+tan(x)/(3)=cosec(kx)/...

[" If "cot(2x)/(3)+tan(x)/(3)=cosec(kx)/(3)," then the value "],[" of "tan^(-1)(tan k)" equals - "],[[" (1) "2,(2)2-pi,(3)pi-2," (4) "2 pi-2]]

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