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Do following two lines can be used interchangeably for making a polite request.If not,why?

"Could you pass me the salt?"

"Would you pass me the salt?"

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"Could" and "Would" do technically have different meanings, but in the case of a polite request, they are 100% interchangeable.

Personally, I always follow could you and would you with please, even if my politeness is not sincere.

Could you please pass the salt?

Would you please stop using my salt?!

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