Help me solve lim x->0 [1-cos(tanx)]/ (x^2)

[Amy Nguyen]

I need a help with lim x->0 [1-cos(tanx)]/ (x^2)
Thank you very much!

 

[stapel]

I need a help with lim x->0 [1-cos(tanx)]/ (x^2)
Thank you very much!

What did you get when you applied l'Hospital's twice?

 

[HallsofIvy]

Is this \(\displaystyle cos(tan(x))\) or \(\displaystyle cos(tan^{-1}(x)\)?