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Pre-Calculus - Evaluating for the Double Angle of Sine with a Triangle
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Mathematics
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11th Grade - University
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Hard
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The video tutorial explains how to calculate the sine of 2U given that sine of U is -4/5. It introduces the formula for sine of 2U, which is 2 times sine of U times cosine of U. The tutorial then guides the viewer through determining the cosine of U by constructing a triangle in the correct quadrant, using the Pythagorean triple to find the missing side. Finally, it demonstrates how to plug the values into the formula to find the sine of 2U.
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