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Give an unambiguous context-free grammar for The language of all algebraic expressions over the variables x,y,z with the operators of addition +, subtraction ?, multiplication

Give an unambiguous context-free grammar for

The language of all algebraic expressions over the variables x,y,z with the operators of addition +, subtraction ?, multiplication ?, exponentiation ??, and negation ?, and with parentheses. Your grammar must respect the usual precedence of operators. You will need at least three variables.

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