Sinusoidal equations are mathematical expressions that model periodic phenomena using sine or cosine functions. They take the form of $y = A \sin(B(x - C)) + D$ or $y = A \cos(B(x - C)) + D$, where 'A' represents the amplitude, 'B' affects the period, 'C' is the horizontal shift, and 'D' is the vertical shift. Understanding sinusoidal equations is essential for solving trigonometric equations with inverse functions, as these functions often require identifying and manipulating sinusoidal patterns to find solutions.
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