Hidden Label: left bracket, left parenthesis, "t" Subscript, 5 , Baseline left parenthesis, 1 minus "k" , right parenthesis , "k" , right parenthesis , left parenthesis, StartFraction, "t" Subscript, 1 , Baseline "k" plus "t" Subscript, 5 , Baseline left parenthesis, 1 minus "k" , right parenthesis Over 2 , EndFraction , StartFraction, "t" Subscript, 5 , Baseline left parenthesis, 1 minus "k" , right parenthesis minus "t" Subscript, 1 , Baseline "k" Over 2 , EndFraction , right parenthesis , left parenthesis, "t" Subscript, 1 , Baseline "k" , 1 minus "k" , right parenthesis , right brackett51−k,k,t1k+t51−k2,t51−k−t1k2,t1k,1−k