Desktop users can simply start typing:

• Type digits, x, e, and + − * /.
• Use ^ or Shift+6 for an editable power.
• Negative powers accept -2 or (-2).
• Type trig, inverse trig, hyperbolic, ln, log, sqrt, or exp functions.
• ArrowLeft and ArrowRight move through every formula position.
• Backspace and Delete edit beside the cursor.
• Paste supported expressions directly into the active position.
• Enter checks; Esc closes help or unfocuses.