Video Solution — Option A · slide + narration
What you're watching: a client-rendered "video" — LaTeX slides that build up line by line, synced to spoken narration. In production the narration would be OpenAI TTS (crisp US male voice) rendered server-side into a single MP4 you can share. This demo uses the browser's built-in speech engine so you can hear the timing without me having to encode ffmpeg output.
Question: Find the stationary points of f(x) = x³ − 6x² + 9x − 2 and classify them.
Cost per video: ~$0.05 (OpenAI TTS). Scalable to every question in your bank.
Option B (Manim) is rendering — I'll drop it in the next message. Watch this one first: hit ▶, listen to the narration, notice how each algebraic line pops onto the slide as the narrator gets to it. That's the "line-by-line reveal + spoken intuition" pattern that scales cheaply.