? Hyperbolic sine function is a kind of hyperbolic function. Write it down as sinh, which can also be abbreviated as sh.

Its definition formula is:

The image is:

Combined with the image, we can see that the properties of hyperbolic sine function are as follows:

(1) domain: (-∞,+∞)

(2) Monotonicity: monotonic increase.

(3) Parity: odd function