If int (dx) /(5+4 sin x ) =a tan^(-1) [ ...

If `int (dx) /(5+4 sin x ) =a tan^(-1) [ b tan ""(x)/(2) +(4)/(3)]+c ` then

A

`a = (2)/(3)`

B

`a = (1)/(3)`

C

`b = (5)/(3)`

D

`b = (2)/(3)`

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