#71 · Trigonometry · Exact values

The exact sine of fifteen degrees

Your calculator says $sin 15° \approx 0.2588$ . But $15°$ is a difference of angles you already know. Find the *exact* value.

~8 minWritten answer · check your work with LemmaAngle subtractionExact values

Stuck? A gentle nudge

Something off?

Workspace

Your working

Check your full solution

Attach photos of your pages (up to 3) or one PDF — or check what you typed above. Lemma reads the work and verifies the reasoning, not just the answer.

Your first check today doesn't need an account.

Your photos and PDFs are read once and not stored — only the transcription is kept.