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[2tan^(-1){cos alpha(tan^(-1)x)-tan(cot^...

[2tan^(-1){cos alpha(tan^(-1)x)-tan(cot^(-1)x)}" is equal "],[[" (a) "cot^(-1)x," (b) "cot^(-1)(1)/(x)],[" (b) "tan^(-1)x," (d) none of these "]]

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