True or False: f(x)=x^3-2x^2+x-1 has exactly 3 total roots (real and non-real).

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) = .

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct