using "and which"

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Please help me to bring out the meaning and role ( function) of "and which, using integration" in the following sentence. "These produce results that would be more difficult and tedious to obtain by integration, and which, using integration, may be expressed in a form that is more difficult to interpret and understand"

andwhich asked Oct 17 '13 at 08:53 sokhanh82 New member

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Which is a pronoun.  It refers to something previously mentioned (the results) and is used at the beginning of a clause that is going to provide additional information about that thing. 

 

You may get a little confused because it is followed by [, using integration,].  This is a non-essential phrase and is surrounded by commas.  the sentence can stand on its own without it. 

 

, and which may be expressed....

link answered Oct 17 '13 at 12:58 Patty T Grammarly Fellow

Thank you for your answer,What happens if we use "which" instead of "and which" ?

sokhanh82Oct 19 '13 at 06:35

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