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If at any point (x1, y1) on the curve y=...

If at any point `(x_1, y_1)` on the curve y=f(x) the lengths of the subtangent and subnormal are equal, then the length of the tangent drawn to that curve at that point is

A

`2|y_1|`

B

`sqrt2 | y_1 |`

C

`sqrt5 |y_1|`

D

`sqrt2 |y_1/x_1|`

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The correct Answer is:
B
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