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    Which calculator to use for "arctan(tan(269))"?
    From: Tony Oz
    Date: 2016 Nov 3, 15:31 -0700

    My Casio fx-85ES Plus gives me tan-1(tan(269))=89, which is an unpleasant surprise for me.

    Because of that the formula

    Zc = tan-1{ [ cos(Dec) · sin(GHA+LonAP) ] / [ cos(LatAP) · sin(Dec) - sin(LatAP) · cos(Dec) · cos(GHA+LonAP) ] }

    on my fx-85ES has 180° ambiguity.

    Is there a more smart calculator that could handle all the -180°...+180° range for reverse trig functions?

    Thank you in advance.

    Regards,

    Tony

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