In pendulum experiment, we assume sin() approximately equal to and derive T=2pi sqr(l/g)

however if is bigger than 10 degree the period will change signifiantly

Angle (degrees)	dT (s)
5	1.288
10	1.279
15	1.283
20	1.284
25	1.289
30	1.296
35	1.305
40	1.311
45	1.327
50	1.33
55	1.337
60	1.35

Graph the variation of the period T with the angle to comment on the features of the graph when the small angle approximation ie. sin =

is no longer true.