Coth
The hyperbolic cotangent is defined by $$\mathrm{coth}(z)=\dfrac{1}{\tanh(z)}=\dfrac{\mathrm{cosh}(z)}{\mathrm{sinh}(z)},$$ where $\tanh$ denotes the hyperbolic tangent function.
Plot of $\mathrm{coth}$ on $[-5,5]$.
Domain coloring of $\mathrm{coth}$.
Properties
Derivative of coth
Antiderivative of coth
Relationship between coth and csch
Relationship between coth and cot
Relationship between cot and coth
Relationship between csc, Gudermannian, and coth
Relationship between coth, inverse Gudermannian, and csc
Pythagorean identity for coth and csch
Coth of a sum
z coth(z) = 2z/(e^(2z)-1) + z
z coth(z) = sum of 2^(2n)B_(2n) z^(2n)/(2n)!
z coth(z) = 2 Sum of (-1)^(n+1) zeta(2n) z^(2n)/pi^(2n)
Videos
Calculus I - Derivative of Hyperbolic Cotangent Function coth(x) - Proof
See Also
References
- 1964: Milton Abramowitz and Irene A. Stegun: Handbook of mathematical functions ... (previous) ... (next): $4.5.6$
