Use the definitions of hyperbolic cosine and hyperbolic sine (their formulas) to prove the identity below. Show your work neatly in the space provided.
h2 − h2 = 1

See below

Step-by-step explanation:

By definition:

We want to show that:

We substitute into the left side to get:

We apply exponential rule to get:

We expand:

146%

step-by-step explanation:

60: 45 =12: 9 =4: 3 so the answer is 4: 3