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[" If in a "Delta ABC,/B=(2 pi)/(3)" the...

[" If in a "Delta ABC,/_B=(2 pi)/(3)" then the "cos A+cos C" lie in "],[[" (A) "[-sqrt(3),sqrt(3)]," (B) "(-sqrt(3),sqrt(3)]],[" (C) "((3)/(2),sqrt(3)]," (D) "[(3)/(2),sqrt(3)]]]

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