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The distance between the points (a cos ...

The distance between the points (`a cos alpha, a sin alpha`) and (`a cos beta, a sin beta`) is

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The correct Answer is:
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`PQ=sqrt(a^2(cosalpha-cosbeta)^2=a^2(sinalpha-beta)^2)`
`a=sqrt(sin^2alpha+cos^2alpha+cos^2beta+sin^2beta-2cosalphacosbeta-2sinalphasinbeta)`
`a=sqrt(2(1-cos(alpha-beta))`
`a=sqrt(2xx2sin^(2).(alpha-beta)/(2))`
`=2a"sin"(alpha-beta)/(2)`
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