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WWW.MATHEMATICATOR.COM The unit circle is a brilliant concept for working with trigonometric functions. It takes almost nothing out of your memory. Everything can be derived. It is invaluable for solving trigonometric equations. Related videos: Trigonometry - introduction - angles - degrees versus radians • Trigonometry - introduction - angles - degrees in... Trigonometric functions - introduction • Trigonometric functions - introduction - Fairy tale... Trigonometry - Sine and cosine - basics • Trigonometry - Sine and cosine - basics Trigonometry - Sine and cosine - Unit circle 1 • Trigonometry - Sine and cosine - Unit... Trigonometry - Sine and cosine - Unit circle 2 • Trigonometry - Sine and cosine - Unit... Trigonometric equation 1 • Trigonometric equation 1 Trigonometric equation 2 • Trigonometric equation 2 Trigonometry - Unit circle - trigonometric equation 3 • Trigonometry - Unit circle - g...