# math.J1() Function in Golang With Examples

Go language provides inbuilt support for basic constants and mathematical functions to perform operations on the numbers with the help of the math package. You can find order-one Bessel function of the first kind with the help of J1() function provided by the math package. So, you need to add a math package in your program with the help of the import keyword to access the J1() function.

Syntax:

func J1(a float64) float64
• If J1(±Inf), then this function will return 0.
• If J1(NaN), then this function will return NaN.

Example 1:

 // Golang program to illustrate // the math.J1() function package main    import (     "fmt"     "math" )    // Main function func main() {        // Finding order-one Bessel      // function of the first kind     // Using J1() function     res_1 := math.J1(math.Inf(-1))     res_2 := math.J1(math.Inf(1))     res_3 := math.J1(4)     res_4 := math.J1(math.NaN())        // Displaying the result     fmt.Printf("\nResult 1: %.2f", res_1)     fmt.Printf("\nResult 2: %.2f", res_2)     fmt.Printf("\nResult 3: %.2f", res_3)     fmt.Printf("\nResult 4: %.2f", res_4)    }

Output:

Result 1: 0.00
Result 2: 0.00
Result 3: -0.07
Result 4: NaN

Example 2:

 // Golang program to illustrate // the math.J1() function package main    import (     "fmt"     "math" )    // Main function func main() {        // Finding order-one Bessel      // function of the first kind     // Using J1() function     nvalue_1 := math.J1(2.0)     nvalue_2 := math.J1(4.1)        // Sum of the given numbers     res := nvalue_1 + nvalue_2     fmt.Printf("%.2f + %.2f = %.2f",             nvalue_1, nvalue_2, res)    }

Output:

0.58 + -0.10 = 0.47

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