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Considering this, what is tan value?
Tangent or Tan function is defined as avalue (or the ratio) obtained by dividing the Opposite Sideby Adjacent Side with reference to angle being measured in a RightAngled Triangle. It also is same as Sin(deg)/Cos(deg).
Similarly, you may ask, what is tan A?
In any right triangle, the tangent of an angle is thelength of the opposite side (O) divided by the length of theadjacent side (A). In a formula, it is written simply as'tan'. Often remembered as "TOA" - meaning Tangent isOpposite over Adjacent. See SOH CAH TOA. tan.
As it passes through the point where the tangentline and the curve meet, called the point of tangency, thetangent line is "going in the same direction" as the curve,and is thus the best straight-line approximation to the curve atthat point. The word "tangent" comes from the Latin tangere,"to touch".