COS() : function

SELECT COS(PI()); // Output is -1
SELECT ROUND(COS(PI()/2),2); // Output is 0.00
SELECT ROUND(COS(PI()/3),2); // Output is 0.5 
We used ROUND() to show only two decimal places.

Syntax
SELECT COS( X )
X is in Radian

COS() with PI()

mathematical constant PI() (π) value is 3.141593

COS() with RADIANS

Radians function convert degree value to radian.

SELECT COS(RADIANS(0)); // Output is 1
SELECT ROUND(COS(RADIANS(90)),2); // Output is 0.00
SELECT COS(RADIANS(180)); // Output is -1
SQL Math References TAN() to get tangent sin()
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