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How to find the cosine of a given radian value in Golang?
In this tutorial, we will learn how to find the cosine of a given radian value in the Golang programming Language. Golang language has many packages with predefined functions that the developer can use without writing the complete logic.
To perform the mathematical operations and logic we have a math package in Golang. We will use this package only to find the cosine of a given radian value. We will also see how to import the package and also how to call a function this package consists of by writing a Golang code.
Cosine
Definition
Cosine is a function that is part of trigonometry. To understand Cosine observe the diagram below.
If we define cosine with the help of the above diagram. The angle Ө with function cosine is equal to the ratio of adjacent and hypotenuse.
cosӨ = adjacent / hypotenuse
Value of cosine at different angles
cos(0) = 1
cos(30) = √3 / 2
cos(45) = 1 / √2
cos(60) = 1 / 2
cos(90) = 0
cos(120) = -1 / 2
cos(135) = - 1 / √2
cos(150) = -√3 / 2
cos(180) = - 1
Graph
Now we will see the graph for the cosine function and observe the above values on the graph. For angle zero the value is one then till the angle becomes 90 degrees the value is zero. Then again till 180 degrees, we will get a mirror in the fourth quadrant.
Algorithm
Step 1 - Declaring the variable to store the value of the guardian and answer of float32 type.
Step 2 - Initializing the variable of a radian.
Step 3 - Call the function of cosine and pass the radian value.
Step 4 - Printing the result.
Example
In this example, we will write a Golang program in which we will import a math package and call the cosine function.
package main import ( // fmt package provides the function to print anything "fmt" // math package provides multiple functions for different // mathematical operations "math" ) func main() { // declaring the variables to store the value of radian value and answer var radianValue, answer float64 fmt.Println("Program to find the cosine of a given radian value in the Golang programming language using a math package.") // initializing the value of radian value radianValue = 4.5 // finding cosine for the given radian value answer = math.Cos(radianValue) // printing the result fmt.Println("The cosine value with the value of radian", radianValue, "is", answer) }
Output
Program to find the cosine of a given radian value in the Golang programming language using a math package. The cosine value with the value of radian 4.5 is -0.21079579943077972
Algorithm
Step 1 - Declaring the variable to store the value of the guardian and answer of float32 type.
Step 2 - Initializing the variable of a radian.
Step 3 - Call the function of cosine defined by us and pass the radian value as a parameter.
Step 4 - Printing the result.
Example
In this example, we will write a Golang program in which we will import a math package and call the cosine function in a separate function and call that function main.
package main import ( // fmt package provides the function to print anything "fmt" // math package provides multiple functions for different // mathematical operations "math" ) // this is a function with a parameter of float64 type and a return type of float64 func Cosine(angle float64) float64 { // returning the cosine of the angle return math.Cos(angle) } func main() { // declaring the variables to store the value of radian value and answer var radianValue, answer float64 fmt.Println("Program to find the cosine of a given radian value in the Golang programming language using a separate function in the same program.") // initializing the value of the radian value radianValue = 4.5 // finding cosine for the given radian value in separate function answer = Cosine(radianValue) // printing the result fmt.Println("The cosine value with the value of radian", radianValue, "is", answer) }
Output
Program to find the cosine of a given radian value in the Golang programming language using a separate function in the same program. The cosine value with the value of radian 4.5 is -0.21079579943077972
Conclusion
These are two ways to find the cosine by using the function in the math package and passing the radian value as a parameter. The second approach will provide abstraction in the program. To learn more about Golang you can explore these tutorials.