The math.acosh() function returns the inverse hyperbolic cosine of a number.

Syntax:
math.acosh(x)
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Where, x is a number which must be greater than or equal to 1.

The function returns the inverse hyperbolic cosine of x, which is a number between 0 and pi. 

ExampleEdit & Run
import math

print(math.acosh(3))

print(math.acosh(7))
print(math.acosh(52))
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Output:
1.762747174039086 2.6339157938496336 4.644298430695373 [Finished in 0.010770312044769526s]

This function is useful for calculating angles and distances in trigonometry problems.