Pls will give great review 4. which ordered pair would not be a solution to y = x*3 - x? 1) (-4,-60) 3) (-2,-6) 2) (-3.-24) 4) (-1,-2)

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

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) = .

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?