Two parallel chords are drawn on the same side of the centre of a circle of radius R. It is fouind that they subtend angles of ` theta` and ` 2theta` at the centre of the circle. The prependicular distance between the chords is
A. `2 R sin(3thetA)/(2)sin(theta)/(2)`
B. `(1-cos (theta)/(2))(1+2cos(theta)/(2))R`
C. `(1+cos(theta)/(2))(1-2cos(theta)/(2))R`
D. `2R sin (3 theta)/(4)sin(theta)/(4)`
