What is the measure of angle BCD? 146° O 250 O 40° D o 140° 1490 c O 1550​

Which graph represents the following piecewise defined function?

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

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) = .