atan -- compute the arctangent
Ways to use atan :
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"atan(CC)" -- see atan(RR) -- compute the arctangent of a number
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"atan(QQ)" -- see atan(RR) -- compute the arctangent of a number
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atan(RR) -- compute the arctangent of a number
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"atan(ZZ)" -- see atan(RR) -- compute the arctangent of a number