mcp-openmsx

# ATN() ## Effect Returns the arctangent of a variable. ## Syntax `ATN(<Number>)` ## Parameter `<Number>` can be a value, a numeric variable or an expression. ## Example ```basic 10 PRINT "The arctangent of 1 is ";ATN(1) 20 PRINT "The arctangent of -1.23 is ";ATN(-1.23)   RUN The arctangent of 1 is .78539816339745 The arctangent of -1.23 is .88817377437769 ``` ## Related to `COS()`, `SIN()`, `TAN()` ## Compatibility MSX-BASIC 1.0 or higher ## Source Retrieved from "https://www.msx.org/wiki/ATN()"