The following data points represent the number of jars of honey Sandy the Bear consumed each day this week. 1,4,2,3,0,3,21, comma, 4, comma, 2, comma, 3, comma, 0, comma, 3, comma, 2
Using this data, create a dot plot where each dot represents a day.

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .