Pre-Calculus - Find the Double Angle of Tangent When Given a Triangle with Restrictions

The video tutorial covers solving a trigonometry problem involving angles not on the unit circle. The teacher explains how to determine the quadrant of an angle, construct a triangle, and calculate trigonometric functions like sine and cosine using specific formulas. The process includes identifying the correct quadrant, using the Pythagorean triple, and simplifying expressions to find the final result.

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