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`lim_(xrarr0)(cos 2x-1)/(cosx-1)` |
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Answer» `underset(xrarr0)(cos 2x-1)/(cosx-1) ((0)/(0))` `=underset(rarr0)"lim"((2cos^(2)x-1))/(cosx-1)` `=underset(xrarr0)"lim"(2(cosx-1)(cosx+1))/(cosx-1)` `=underset(xrarr0)"lim"2(cos x+1)=2(1+1)=4` |
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