asin():
X is the angular value in radian. We get output as ARC SIN of the input angle. It is X==sin(asin(X)) It takes input range from +1 to -1 , for any other input it returns NAN ( not a number )
deg2rad() with asin()We can use deg2rad() to convert Degree value to radian and then use asin().
Plotting of SIN & SIN curves by using PHP GD function with deg2rad()
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