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Trigonometric Functions

Sine, cosine, and tangent defined on the unit circle: cos θ and sin θ are the x and y coordinates of a point at angle θ, giving smooth periodic functions with period 2π and the identity sin²θ + cos²θ = 1.

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How To Graph Trigonometric Functions | Trigonometry

The abstract theory presented is the analytical method for characterizing and constructing sinusoidal functions defined by four intrinsic parameters: amplitude ($|a|$), period determined by coefficie…