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The area of the parallelogram formed by ...

The area of the parallelogram formed by the lines `xcosalpha + y sin alpha =p, x cos alpha + y sin alpha = q,x cos beta + y sin beta=r` and `x cosbeta+y sinbeta = s` for given values of p, q, r and s is least, if `(alpha - beta)=` (A) `+-pi/2` (B) `pi/4` (C) `pi/6` (D) `pi/3`

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