fix ACOS implementation: in Excel only defined in range [-1, 1]
if input is not in range, throw exception.

adding unit tests for ACOS
1 parent 1d61868 commit 92ad7b76a40c14b1d836ae35a2fc6304dab59688
@Peter Amrehn Peter Amrehn authored on 28 Oct 2017
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ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs
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ClosedXML_Tests/Excel/CalcEngine/MathTrigTests.cs