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Find lim(x->0)(cos2x-1)/(cosx-1)...

Find `lim_(x->0)(cos2x-1)/(cosx-1)`

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Given `(lim)_(x->0)(cos2x-1)/(cosx-1)`
`= (lim)_(x->0)((1-2sin^2x)-1)/(cosx-1)`
= `(lim)_(x->0)(1-2sin^2x-1)/(cosx-1)`
= `(lim)_(x->0)(-2sin^2x)/(cosx-1)`
...
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