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lim(xrarr0)(cos 2x-1)/(cosx-1)...

`lim_(xrarr0)(cos 2x-1)/(cosx-1)`

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`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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