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The development of modern trigonometry shifted during the western Age of Enlightenment, beginning with 17th-century mathematics (Isaac Newton and James Stirling) and reaching its modern form with Leonhard Euler (1748).
4.3 Right Triangle Trig Word Problems Day 1 . Trigonometric functions are often used to analyze real-life situations. The easiest way to understand these problems is to first draw a diagram to illustrate the problem. Angle of Depression: Angle of Elevation: Part I Directions: Draw diagrams to illustrate the problem.