sinh mean lion.
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cosh^2 x - sinh^2 x = 1 cosh x = 1+ sinh^2 x cosh x = 1+(-3/5)^2 cosh x = 1+9/25 = 34/25 cosh 2x = 2 sinh x cosh x cosh 2x = 2 (-3/5) (34/25) =-204/125
Yes, but it is called a hyberbolic trigonometric function
The curve given by (t-sinh(t)cosh(t), 2 cosh(t)), t real.
∫ cosh(x) dx = sinh(x) + C C is the constant of integration.
∫ 1/sinh(x) dx = ln(tanh(x/2)) + C C is the constant of integration.