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10 cards from this deck
Equations with sine, cosine, or tangent functions.
It expresses double angles in terms of single angles.
sin 2x = 2 sin x cos x.
To simplify the analysis of trigonometric equations.
Use sin 2x = 2 sin x cos x to form a quadratic.
It equals 1 and simplifies complex equations.
r = √(a² + b²) for a sin x + b cos x.
Incorrectly applying domain or interval checks.
To ensure they are within specified intervals.
They repeat values at regular intervals.
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