Can someone tell my what cos, sin and tan actually measure?

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Can someone tell my what cos, sin and tan actually measure?

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Draw a circle at the origin of a 2D graph with a radius of 1. Draw a line (technically a ray) from the origin. The angle is measured from the positive x axis to the line. (Cosine, Sine) are the coordinates where it hits the circle. Tangent is the slope.

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