1.

Evaluate the following limits: `lim_(xrarr0)(cos2x-1)/(cosx-1)`

Answer» Correct Answer - 4
`lim_(xto0)(cos2x-1)/(cosx-1)=lim_(xto0)(2cos^(2)x-2)/(cosx-1)=lim_(xto0)(2(cos^(2)x-1))/((cosx-1))=2lim_(xto0)(cosx+1)=4.`


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