Neither, it is a mathematical discipline.
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It is the reciprocal of the sine ratio.
Tangent is the ratio between perpendicular to the base of the triangle.
Yes a tangent is a straight line thattouches a curve at only one point But there is a tangent ratio used in trigonometry
If you have a right triangle, the sine of an angle is the ratio of the opposite side to the hypotenuse.
They don't. If they did then trigonometry would be virtually non-existent.