Answer:
See below.
Step-by-step explanation:
sin x / x.
You can prove this by L'Hopitals Rule.
If x = 0 then the function = 0/0 so the above rule is applicable here.
Differentiating top and bottom we get cos x / 1 = cos x.
Limit x --> 0 of cos x = 1 so it is proved.
