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[" 21.If "p,q" denote the lengths of the...

[" 21.If "p,q" denote the lengths of the perpendicu "],[" lars from the origin on the lines "],[x sec alpha-y cos ec alpha=a" and "],[x cos alpha+y sin alpha=a cos2 alpha" then "],[" 1) "4p^(2)+q^(2)=a^(2)quad " 2) "p^(2)+q^(2)=a^(2)],[" 3) "p^(2)+2q^(2)=a^(2)quad " 4) "4p^(2)+q^(2)=2a^(2)]

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