The graph of y < 2x - 3is shown. Which set contains only points that satisfy the inequality?
O A. {(5,7).(-3,-10). (5.-7), (-1,4)}
B. -1,-10). (5, 7).(-4, -13), (3, -2)}
OC. (-4.-12), (-1.-5), (3, 4), (5, 6)}
OD. (3.3). (-4-1). (-1, -8). (5,0)}

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) = .