Returns the hyperbolic cosine of a number.

numberThe number you want the hyperbolic cosine of.

* For an illustrated example refer to the [[Hyperbolic Functions]] page.
* The inverse of this function is the ACOSH function.
* The "number" is the angle in radians.
* If "number" is not numeric, then #VALUE! is returned.
* If your argument is in degrees, multiply it by PI/180 to convert it to radians.
* You can use the ACOSH function to return the inverse hyperbolic cosine.
* You can use the SECH function to return the reciprocal hyperbolic cosine (1/COSH)
* You can use the SINH function to return the hyperbolic sine.
* You can use the TANH function to return the hyperbolic tangent.
* You can use the DEGREES function to convert from radians to degrees
* For the Microsoft documentation refer to
* For the Google documentation refer to

1=COSH(4) = 27.308
2=COSH(-0.5) = 1.128
3=COSH(EXP(1)) = 7.610
4=COSH(ACOSH(1)) = 1
5=COSH("some text") = #VALUE!

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