1.

The sum of the series, sin theta sec(3theta)+sin 3theta sec(3^(2)theta)+sin(3^(2)theta)sec(3^(3)theta)+……. upto n terms, is

Answer»

`(1)/(2)[tan 3^(n)theta-tan 3^(n-1)theta]`
`[TAN3^(n)theta-tan theta]`
`(1)/(2)[tan 3^(n)theta-tan theta]`
`(1)/(2)(tan 3^(n)theta-1)`

ANSWER :B


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