The length of the subtangent to the curv...

The length of the subtangent to the curve `x^m y^n = a^(m + n)` at any point `(x_1,y_1)` on it is

A

`n/m x_1`

B

`m/n|x_1|`

C

`n/m|y_1|`

D

`n/m|x_1|`

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