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

[" 7."cot^(-1)[(cos alpha)^(1/2)]+tan^(-1)[(cos alpha)^(1/2)]=x," then "sin x" is equal to "],[[" (3) "tan alpha," (2) "cot^(2)((alpha)/(2))],[" (4) "1," (4) "cot((alpha)/(2))]]

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