1.

Integration by partial fraction : int(dx)/(4 sin^(2)x+5cos^(2)x)dx=...+c

Answer»

`(1)/(sqrt(5))tan^(-1)((2tanx)/(sqrt(5)))`
`(1)/(sqrt(5))tan^(-1)((TANX)/(sqrt(5)))`
`(1)/(2sqrt(5))tan^(-1)((2tanx)/(sqrt(5)))`
None of these

Answer :C


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