Java Math.expm1() method

Last Updated : 17 Mar 2025

The java.lang.Math.expm1() is used to return the Euler's number e raised to the power of a double value and subtract one form it. Here, e is an Euler's number and it is approximately equal to 2.718281828459045.

Syntax

Parameter

x = It is the exponent to raise e to in the computation of e^x -1.

Return

It returns the value of e^x - 1

• If the argument is positive or negative double value, this method will return the output.
• If the argument is Positive Infinity, this method will return Positive Infinity.
• If the argument is Negative Infinity, this method will return -1.0.
• If the argument is Zero, this method will return Zero with the same sign as the argument.
• If the argument is NaN, this method will return NaN.

Example 1

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Example 2

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Example 3

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Example 4

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Example 5

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Example 6

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