TAN() function

SELECT TAN( X )
X is in Radian

TAN() with PI()

mathematical constant PI() (π) value is 3.141593
SELECT ROUND(TAN(PI()),2); // Ouput is -0.00
SELECT TAN(PI()/2); // Ouput is 1.6331239e+16 or infinity 
SELECT ROUND(TAN(PI()/3),2); // Ouput is 1.73 
We used ROUND() to show only two decimal places.

TAN() with RADIANS

Radians function convert degree value to radian.

SELECT TAN(RADIANS(0)); // Ouput is 0
SELECT TAN(RADIANS(45)); // Output is 1 
SELECT TAN(RADIANS(90)); // Output is infinity or 1.63312393531954e+016
SELECT ROUND(TAN(RADIANS(180)),2); // Output is -0.00
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