Key Technical Features
Logic Separation: The calculator uses a "Visual String" for the user (e.g., $sin(90)$) and a "Logic String" for JavaScript (e.g., $Math.sin(90 \cdot \frac{\pi}{180})$).
Note: In this basic implementation, trig functions expect Radians. For Degrees, you would multiply the input by $\frac{\pi}{180}$.
Auto-Parentheses: To prevent errors, the
calculate()function checks if there are unclosed brackets and automatically adds them before evaluating.History Management: Every calculation is prepended to a history list. Clicking a history item restores that result to the main display for further calculation.
Precision Handling: It uses
.toFixed(8)combined with a regex to remove trailing zeros, ensuring results like $0.1 + 0.2$ don't display as $0.30000000000000004$.