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Find the equation of the straight lines passing through the followi...
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Find the equation of the straight lines passing through the following pair of points:
\[
(a \cos \alpha, a \sin \alpha) \text { and }(a \cos \beta, a \sin \beta)
\]
\[
(a \cos \alpha, a \sin \alpha) \text { and }(a \cos \beta, a \sin \beta)
\]