Question

If `cos theta = 2/3 , " write the value of" (4+4 tan^2 theta).`

Answer 1

`4+4 tan^2 theta `

        = `4(1+ tan ^2 theta)`

         =`4 sec^2 theta `

          =`4/ cos^2 theta`

          =`4/(2/3)^2`

          =`4/((4/9))`

          =`(4xx9)/4`

           =9