Recursion for mathematical expressions

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The input is a mathematical expression in the form of a String. The expression may include whole numbers, fractional numbers, parentheses (), spaces, negative signs -, exponents ^, sin(x), cos(x), and tan(x).
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Justin Smith
Level 38 , Greenfield, USA, United States
29 October 2022, 12:40
This can be done, but I feel like this is an exercise in doing something the wrong way. The recursive function would be better off written as returning a double so that you can pass substring components of the expression string and return their outcomes. Doing it as a void method is much more cumbersome, as evidenced by the official solution being over 300 lines long.
Level 41 , Gdańsk, Poland
29 October 2020, 17:32
Can anybody help?