Sinh of a sum

Theorem

The following formula holds: $$\sinh(z_1+z_2)=\sinh(z_1)\cosh(z_2)+\cosh(z_1)\sinh(z_2),$$ where $\sinh$ denotes hyperbolic sine and $\cosh$ denotes hyperbolic cosine.

References

• 1964: Milton Abramowitz and Irene A. Stegun: Handbook of mathematical functions ... (previous) ... (next): $4.5.24$