[" For "Delta ABC,a=2,b=sqrt(6),c=sqrt(3...

[" For "Delta ABC,a=2,b=sqrt(6),c=sqrt(3)+1," then "],[cos C=........." ."],[[" (a) "(sqrt(6)+sqrt(2))/(4)," (b) "(sqrt(6)-sqrt(2))/(4)],[" (c) "(sqrt(3)+1)/(2)," (d) "(sqrt(3)-1)/(2)]]

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