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If a cot theta + b "cosec" theta = p and...

If `a cot theta + b "cosec" theta = p and b cot theta + a "cosec " theta = q `, then ` p^(2)-q^(2)`=

A

`a^(2)-b^(2)`

B

`b^(2)-a^(2)`

C

`a^(2) + b^(2)`

D

`b-a`

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