1.

If the quadratic equation 4^("sec"^(2)alpha).X^(2)+2x+(beta^(2)-beta+(1)/(2))=0 has real roots , then the value of cos^(2)alpha + cos^(-1)beta is

Answer»

`(pi)/(3)`
`(pi)/(3)+1`
`(pi)/(2)`
`(pi)/(2)-1`

ANSWER :B


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