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Added type annotations on public methods, to aid in type checking and autocomplete.
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Added sin², sin³, sin⁻¹, etc. methods for common mathematical notation such as sin²(x) for sin(x)**2, and sin⁻¹(x) for asin(x).
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Dropped BasicArithmeticParser synonym for ArithmeticParser (too easily confused with BaseArithmeticParser).
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Added symmetric difference set operations, supported by '∆' and '^' operators.
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Added radical expressions for roots > 2, up to 9, to the ArithmeticParser class:
³√2 -> 2**(1/3) (1.259921049894873)
⁹√2 -> 2**(1/9) (1.080059738892306) -
Added Unicode variable assignment operator '←'.
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Added option to allow/disallow user-defined variables in expressions.
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Added better docstring to enumerate all supported parser options.
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Added scan_string method, to replace deprecated scanString method.
(Many features added by @theonemusic, thanks!)