Application of DerivativeHard

Question

The length of the sub tangent at any point of the curve y = ax³ is-

Options

A.x

B.x/3

C.x/a

D.ax

Solution

Equation of curve y = ax³
Length of subtangent = y¹ ×
= 3ax² = 3ax²₁
length = y₁ ×

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