Trigonometry is an important part of mathematics and PHP’s math functions provides us with some functions which are very useful for calculations involving trigonometry. The cos()function in PHP is used to find the cosine of a number.
The cos() function returns a float value between -1 and 1, which represents the cosine of the angle. The argument passed to it must be in radians.
Parameters: This function accepts a single parameter value. It is the number whose cosine you want to find. The value must be in radians.
Return Value: It returns a floating point number which is the cosine value of number passed to it as argument.
Input : cos(3) Output : -0.98999249660045 Input : cos(-3) Output : -0.98999249660045 Input : cos(2*M_PI) Output : 1 Input : cos(0) Output : 1
Below programs illustrate cos() function in PHP:
- Passing 3 as a parameter:
- Passing -3 as a parameter:
- When (2*M_PI) is passed as a parameter, M_PI is a constant in PHP whose value is 3.1415926535898:
- Passing 0 as a parameter:
- PHP | min( ) Function
- PHP | max( ) Function
- D3.js | d3.mean() function
- p5.js | sq() function
- p5.js | abs() function
- D3.js | d3.max() function
- p5.js | hex() function
- D3.js | d3.set.has() Function
- p5.js | arc() Function
- PHP | abs( ) Function
- PHP | Ds\Map xor() Function
- CSS | rgb() Function
- D3.js | d3.rgb() Function
- p5.js | nfp() Function
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to firstname.lastname@example.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.