2cos^2B-1 = tan^2 then cosAcosB
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Answer:
2 Cos^2 B -1 = Sec^A-1
2 Cos^2B = 1/Cos^2A ---- Cos^2A × Cos^2B=1/2
CosA × CosB = +- 1/√2
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your answer is
cos A . cos B= + 1/2 , cos A . cos B= -1/2
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