Can the trungles be proven congruent? If so, by which congruence theorem? Yes, the triangles are congruent by SAS (side-angle-side)
Yes, the triangles are congnient by ASA (angle-side-angle) A
Yes, the triangles are congruent by MAS (angle-angle-side) A
No, the triangles cannot be proven content

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) = .