A)narysuj lustrzane odbicie równoległoboku względem czterech zaznaczonych linii ustawienia lusterka. b) a teraz odbij symetrycznie

Which statement justifies why angle ebc measures 90?

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) = .

Using graph paper, determine the line described by the given point and slope. click to show the correct graph below.(0, 0) and 2/3