1.

int _(0)^(pi//2) dx/(4cosx+9sinx)=

Answer»

`1/sqrt(97) LOG ((13-sqrt(97))/(13+sqrt(97)))`
`1/sqrt(97) log ((13+sqrt(97))/(13-sqrt(97)))`
`1/(2sqrt(97)) log ((13-sqrt(97))/(13+sqrt(97)))`
`1/(2sqrt(97)) log ((13+sqrt(97))/(13-sqrt(97)))`

ANSWER :B


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