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What is a small angle approximation?
Professor Walter Lewin shows what is a small angle approximation, namely: cos (theta) approx 1-theta ^2/2. Small-angle approximation is the process in which the formulas for primary trigonometric ratios can be simplified when the angle is small. A small angle is usually less than 15 degrees or 0.26 radians. Each primary trigonometric ratio has ...
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