I n =  @-@  a x + b ( n  @-@  1 ) ( a q  @-@  b p ) ( p x + q ) n  @-@  1 + a ( 2 n  @-@  3 ) 2 ( n  @-@  1 ) ( a q  @-@  b p ) I n  @-@  1 { \ displaystyle I _ { n } =  @-@  { \ frac { \ sqrt { ax + b } } { ( n @-@ 1 ) ( aq @-@ bp ) ( px + q ) ^ { n @-@ 1 } } } + { \ frac { a ( 2n @-@ 3 ) } { 2 ( n @-@ 1 ) ( aq @-@ bp ) } } I _ { n @-@ 1 } \ , \ ! }.
