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[" An if p and p' are perpendicular from the origin on the line "x sec theta-y csc theta=a" and "x cos theta+y sin theta],[" 94.If p and "p'" are perpendicular from the origin on the line "x sec theta-y csc theta=a" and "x cos theta+y" sin "theta],[=a cos2 theta," prove that "4p^(2)+p^(2)=a^(2)" ."]

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