Скачать или смотреть sin 15° Explained: Exact Value via Angle-Difference

Exact Value of sin 15°—Learn how to derive sin 15° using the angle-difference formula (sin (45°−30°)) or half-angle techniques.
In this full-length tutorial, we break down sin 15° using:

The angle-difference identity: sin(45° − 30°) = sin 45° cos 30° − cos 45° sin 30°

Alternatively, the half-angle formula applied to 30°

Step-by-step algebraic simplification for clarity

Final simplified value: (√6 − √2) / 4 or (√3 − 1)/(2√2)
00:00 – Introduction
00:45 – Using Angle-Difference Formula
01:15 – Using Half-Angle Formula
02:00 – Simplification & Final Value

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