Maths-
General
Easy
Question
At any point 
on a curve if the subtangent and subnormal are equal then at that point the length of the tangent is equal to
Hint:
We are given that the length of the subtangent and subnormal of a curve are equal at point P. We have to find the length of tangent.
The correct answer is:
The given point where the subtangent and subnormal is equal is (x1, y1).
Subtangent is the projection of tangent on x-axis.
Subnormal is the projection of normal on x-axis.
The formula of subtangent is 
The formula of subnormal is 
The formula for length of tangent at point (x1, y1)
Subtangent = Subnormal
This is the required answer.
For such questions, we should know the formula of length of tangent, subnormal and subtangent.
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