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tan A = (sin A) / (cos A)

tan (A)= opposite side length/adjacent side length

A is an angle measurement; amount of degrees or radians.

If a line is tangent to a curve, it only touches the curve at one point. looks like )| but the line is touching the curve.

In a circle, the tangent line touches the circle at one point and is perpinducular to the circle's radius if it is touching that same point.

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Q: What is tangent line?
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A line that intersects a circle at exactly one point?

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