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

Let A and B denote the statements A: `"cos"a+"cos"b+"cos"g=""0` B : `"sin"a+"sin"b+"sin"g=""0` If `cos(b g)""+""cos(g a)""+""cos(a b)""=""""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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