Math Expression Evaluator

Evaluate mathematical expressions with variables and functions.

Usage Tips:
- Use standard operators: `+`, `-`, `*`, `/`, `^` (power).
- Common functions: `sin()`, `cos()`, `tan()`, `sqrt()`, `log()`, `exp()`, `abs()`.
- Constants: `pi`, `e`.
- Variables: Define in JSON below (e.g., `{"x": 5, "y": 10}`).

Result

The evaluation result will appear here.

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