Perl Tutorial Perl References

Perl Math - sin() Function



The Perl Math sin() function returns trigonometric sine of an angle (angle should be in radians). In special cases it returns the following:

  • If the argument is NaN or an infinity, then the result is NaN.

In the graph below, sin(x) vs x is plotted.

Sine Function

Syntax

sin(x)

Parameters

x Specify the angle in radian.

Return Value

Returns the trigonometric sine of an angle.

Example:

In the example below, sin() function is used to find out the trigonometric sine of an angle.

use Math::Trig;

print("sin(pi/6) = ".sin(pi/6)."\n");
print("sin(pi/4) = ".sin(pi/4)."\n"); 
print("sin(pi/3) = ".sin(pi/3)."\n");
print("sin(deg2rad(90)) = ".sin(deg2rad(90))."\n");
print("sin(deg2rad(120)) = ".sin(deg2rad(120))."\n");
print("sin(Inf) = ".sin(Inf)."\n");
print("sin(-Inf) = ".sin(-Inf)."\n");
print("sin(NaN) = ".sin(NaN)."\n");

The output of the above code will be:

sin(pi/6) = 0.5
sin(pi/4) = 0.707106781186547
sin(pi/3) = 0.866025403784439
sin(deg2rad(90)) = 1
sin(deg2rad(120)) = 0.866025403784439
sin(Inf) = NaN
sin(-Inf) = NaN
sin(NaN) = NaN

This function can also be used to calculate complex sine of a complex number z. It is a function on complex plane, and has no branch cuts. Mathematically, it can be expressed as:

complex sin

Example:

In the example below, sin() function is used to find out the complex sine of the given number.

use Math::Complex;

$z1 = 2 + 2*i;
$z2 = 2;
$z3 = 2*i;
print("sin($z1) = ".sin($z1)."\n");
print("sin($z2) = ".sin($z2)."\n");
print("sin($z3) = ".sin($z3)."\n");

The output of the above code will be:

sin(2+2i) = 3.42095486111701-1.50930648532362i
sin(2) = 0.909297426825682
sin(2i) = 3.62686040784702i

❮ Perl Math Functions

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