`\text{~~Holi~~}`
`1/`
`4x^2-9y^2`
`= (2x)^2-(3y)^2`
`= (2x+3y)(2x-3y)`
`2/`
`B= (2/(x-3)+2/(x+3)):(2x)/(x^2-9)`
`= ((2x+6)/(x^2-9)+(2x-6)/(x^2-9)):(2x)/(x^2-9)`
`= ((2x+6+2x-6)/(x^2-9)):(2x)/(x^2-9)`
`= (4x)/(x^2-9):(2x)/(x^2-9)`
`= (4x)/(x^2-9).(x^2-9)/(2x)`
`= 2`