We have a angle and we need to find out what x is two sides are 42 and 123 what is x

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

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) = .

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25