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[" 57."cot^(-1)[(cos alpha)^(1/2)]-tan^(...

[" 57."cot^(-1)[(cos alpha)^(1/2)]-tan^(-1)[(cos alpha)^(1/2)]=x," then "sin x" is "],[" equal to "],[[" (a) "tan^(2)((alpha)/(2))," (b) "cot^(2)((alpha)/(2))],[" (c) "tan alpha," (d) "cot((alpha)/(2))]]

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