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[" 14."(cot^(2)15^(@)-1)/(cot^(2)15^(@)+...

[" 14."(cot^(2)15^(@)-1)/(cot^(2)15^(@)+1)=],[[" (a) "(1)/(2)," (b) "(sqrt(3))/(2)," (c) "(3sqrt(3))/(4)]]

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cot (15^(@) -A) + tan(15^(@) + A) =

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