Mathematical proof

Calculus demonstration 2 — Part of the **demonstration** made by the Twelfth Doctor. (TV: *The Pilot*)

The Twelfth Doctor once used the squeeze theorem to prove that $\lim_{\theta\to 0} \frac {sin \theta} {\theta} = 1$ . During the demonstration, the Doctor used mathematical concepts such as sin, cos, tan, inequalities and limit. (TV: The Pilot)