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If p and q are the lengths of the perpen...

If `p` and `q` are the lengths of the perpendiculars from the origin to the straight lines `x sec alpha+y cosec alpha=a` and `x cos alpha-y sin alpha=a cos 2alpha, ` prove that `4p^(2)+q^(2)=a^(2)`

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The correct Answer is:
`=a^(2)`
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