ASIN
Return the arc sine of a float value.
Example
PRINT ASIN(0.5)
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DEF var#=ASIN(0.4)
PRINT var#
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LET var#=0.4
PRINT ASIN(var#)
Output
0.5235987755983
0.41151684606749
0.41151684606749
0.41151684606749
0.41151684606749