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"If the numbers "a,b,c" are in "A.P," th...

` "If the numbers "a,b,c" are in "A.P," then "2b=a+c" .If the numbers "a,b,c" are in G.P,then "b^(2)=ac" If "sin A,cos A,tan A" are in "GP" then "cot^(6)A-cot^(2)A=`

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