Find the length of the perpendicular from the origin to the straight line joining the two points whose coordinates are `(a\ cosalpha,\ a\ s inalpha)a n d\ (a\ cosbeta,\ asinbeta)dot`

Explanation

The Coordinates are `(a cos alpha, a sinalpha)` and `(a cos beta, a sin beta)`.
Equation of the line passing through `(a cos alpha, a sin alpha)` and `(a cos beta, a sin beta)` is


`y-asinalpha=(asinalpha-asinbeta)/(acosalpaha-acosbeta)(x-acosalpha)`


`=>y-asinalpha=(sinalpha-sinbeta)/(cosalpaha-cosbeta)(x-acosalpha)`


`=>y-asinalpha=(2sin(alpha+beta)/2sin(beta-alpha)/2)/(2sin(alpha+beta)/2sin(alpha-beta)/2)(x-acosalpha)`


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