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[" (C) "(pi)/(2)," (D) "(-pi)/(2)],[" 22...

[" (C) "(pi)/(2)," (D) "(-pi)/(2)],[" 22."" ufa "cos^(-1)p+cos^(-1)q+cos^(-1)r=pi," तब "p^(2)+q^(2)+r^(2)+2pqr=],[" (A) "3]

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