cosh 2x = cosh^2 x + sinh^2 x || Hypothesis Trigonometric Identities

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In this video we will prove a hyperbolic trigonometric identity
cosh 2x = cosh^2 x + sinh^2 x.
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you could have used the identity cosh(x+x) which is equivalent to cosh(2x) it would have been easier

NoufKh-el