1.

Evaluation of definite integrals by subsitiution and properties of its : If theta_(1) and theta_(2) be respectively the smallest and the largest values of theta in (0,2pi)-{pi} which satisfy the equation, 2cot^(2)theta-(5)/(sintheta)+4=0, then int_(theta_(1))^(theta_(2))cos^(2)3thetad""theta is equal to :

Answer»

`(2pi)/(3)`
`(PI)/(3)`
`(pi)/(3)+(1)/(6)`
`(pi)/(9)`

ANSWER :B


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