Estimate `lim_(x->0)(cos2x-cosx)/(x^2)`

**From the graphs it appears that the y-intercept is at -1.5.**

`f(.1)~~-1.493759`

`f(.01)~~ -1.499938`

`f(.001)~~-1.499999`

`f(.0001)~~-1.5`

Estimate `lim_(x->0)(cos2x-cosx)/(x^2)`

**From the graphs it appears that the y-intercept is at -1.5.**

`f(.1)~~-1.493759`

`f(.01)~~ -1.499938`

`f(.001)~~-1.499999`

`f(.0001)~~-1.5`