1.

Ifthetais acute and (1-a^(2)) sin theta =(1+ a^(2)) cos theta, thensin theta =

Answer»

`(1-a^(2))/(SQRT(2(1+a^(4))))`
`(sqrt(2(1+a^(4))))/(1-a^(2))`
`(1+a^(2))/(sqrt(2(1+a^(4))))`
`(sqrt(2(1+a^(4))))/(1+a^(2))`

ANSWER :C


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