in trangle ABC angle C=90 degrees, AB=c ,BC= a, AC=b and b 2 =ac then cos B= 1)1/2 2)root5 -1/2 3)root5-1/4 4)1/4 full length solution plss

in trangle ABC angle C=90 degrees, AB=c ,BC= a, AC=b and b 2 =ac then

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