Find the measure of angle CHF. B
с
40°
H
100°
A
D
F
30°
60°
E
mZCHF = [?]°
G

Find the zeros of the function. write the smaller solution first, and the larger solution second f(x)= (x+6)^2-49

How many zeros does the function f(x)=4x3-x2+1 have

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) = .