1.

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

Answer»

`TAN^(2) ALPHA tan^(2) BETA`
`sec^(2) alpha + sec^(2) beta`
`sec^(2)alpha sec^(2)beta`
`tan^(2) alpha +tan^(2) beta`

ANSWER :C


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