Calculus 1 Lecture Notes, Section 2.3

In order to prove these derivative formulas we will need the following formulas which are similar to the corresponding formulas for the trigonometric functions. Proposition 1. (13) – (15) hold. Proof. To prove (13) one has. cosh2x – sinh2x = 2 - 2 = - = 1. To prove (14), divide (13) … ................
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