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If a sec alpha+ b tan alpha= 1 and a^(2)...

If `a sec alpha+ b tan alpha= 1 and a^(2) sec^(2) alpha-b^(2) tan^(2) alpha=5` then `4a^(2)-9b^(2)=`

A

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

B

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

C

ab

D

`-ab`

Text Solution

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The correct Answer is:
A
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