Tangent[point A, conic c]: (All) tangents through point A to conic section c
Tangent[line g, conic c]: (All) tangents to conic section c that are parallel to line g
Tangent[number a, function f]: Tangent to function f(x) at x = a
Tangent[point A, function f]: Tangent to function f(x) at x = x(A)
Tangent[point A, curve c]: Tangent to curve c in point A
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