If two parallel chords of a circle, havi...

If two parallel chords of a circle, having diameter 4 units, lie on the opposite sides of the centreand subtend angles `cos^-1(1/7) and sec^-1(7)` at the centre respectively, then the distance betweenthese chords, is: (a) `4/sqrt7` (b) `8/sqrt7` (c) `8/7` (d) `16/7`

`4//sqrt7`

`8//sqrt7`

`8//7`

`16//7`

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