Liberty BASIC Help Online

Trigonometry

Tip:  There are 2 * pi radians in a full circle of 360 degrees.  A formula to convert degrees to radians is:  radians = degrees divided by 57.29577951 Here are some helpful functions to convert degrees to radians, radians to degrees and to calculate PI.

function pi()
pi = asn(1) * 2
end function

function rad2deg(num)
rad2deg = 90 / asn(1) * num
end function

function deg2rad(num)
deg2rad = asn(1) / 90 * num
end function

 ACS( n )
Description:
This function returns the arc cosine of the number or numeric expression n.  The return value is expressed in radians.

Usage:

print "The arc cosine of 0.2 is "; acs(0.2)

 ASN( n )
Description:
This function returns the arc sine of the number or numeric expression n.  The return value is expressed in radians.

Usage:

print "The arc sine of 0.2 is "; asn(0.2)

 ATN( n )
Description:
This function returns the arc tangent of the number or numeric expression n.  The return value is expressed in radians.

Usage:

print "The arc tangent of 0.2 is "; atn(0.2)

 COS( n )

Description:
This function returns the cosine of the angle n.  The angle n should be expressed in radians.

Usage:

for c = 1 to 45
print "The cosine of "; c; " is "; cos(c)
next c

 SIN( n )
Description:
This function returns the sine of the angle n.  The angle n should be expressed in radians.

Usage:

for t = 1 to 45
print "The sine of "; t; " is "; sin(t)
next t

 TAN( n )
This function returns the tangent of the angle n.  The angle n should be expressed in radians

Usage:

for t = 1 to 45
print "The tangent of "; t; " is "; tan(t)
next t

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