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Let A and B denote the statements A: "co...

Let A and B denote the statements A: `"cos"alpha+"cos"beta+"cos"gamma=""0` B : `"sin"alpha+"sin"beta+"sin"gamma=""0` If `cos(beta-gamma)""+""cos(gamma-alpha)""+""cos(alpha-beta)""=""""-(3//2)` , then (1) A is true and B is false (2) A is false and B is true (3) both A and B are true (4) both A and B are false

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