Guess a number for x that would make the equation true. Check your solution.
5x – 2 = 8

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl

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) = .