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If sec x=P and cosec x=Q then...

If sec `x=P` and cosec `x=Q` then

A

`P^(2)+Q^(2)=P Q`

B

`P^(2)+Q^(2)=P^(2) Q^(2)`

C

`P^(2)-Q^(2)=P^(2) Q^(2)`

D

`P^(2)+Q^(2)=-P^(2) Q^(2)`

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