1.

(1+tan alpha tan beta)^(2) + (tan alpha -tan beta)^(2) =

Answer»

`TAN^(2) alpha tan^(2) BETA`
`sec^(2)alpha sec^(2) beta`
`tan^(2) alpha sec^(2) beta`
`sec^(2) alpha cot^(2) beta`

Answer :B


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