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If aa n db are positive quantities such ...

If `aa n db` are positive quantities such that `a > b ,` the minimum value of `as e ctheta-bt a ntheta` is `2a b` (b) `sqrt(a^2-b^2)` (c) `a-b` (d) `sqrt(a^2+b^2)`

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Minimum value is `sqrt(a^(2)-b^(2))`
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