A ladder is leaning against a wall. The foot of the ladder is 7 feet from the wall. The ladder reaches a height of 16 feet on the wall. What is the approximate measure of the angle the ladder makes the wall? I need help asp

3382-299=3383- ? fill in the blank?

Which of the following is the result of expanding the series

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) = .