Solving trigonometric limits with the cosine double angle identity
In short: Learn how to evaluate a specific trigonometric limit at x = -π/4 by applying a fundamental identity to simplify the expression.
In this instructional video, Bill Scott demonstrates a technique for finding the limit of (1 + √2 sin(x)) / (cos(2x)) as x approaches -π/4. The lesson focuses on using the cosine double angle identity to rewrite the expression, making the limit solvable.
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Sources
- Summary by Intellect · source: Trig limit using double angle identity | Limits and continuity | AP Calculus AB | Khan Academy
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