If \( (a+\sqrt{2} b \cos x)(a-\sqrt{2} b \cos y)=a^{2}-b^{2} \), where \( ab \)
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If \( (a+\sqrt{2} b \cos x)(a-\sqrt{2} b \cos y)=a^{2}-b^{2} \), where \( ab \)https://bit.ly/YTAI_PWAP https://www.pw.live
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