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Question

The length of the subtangent at any point (x1,y1) on the curve y=5x is

A
5x1
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B
y1.5x1
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C
loge5
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D
1loge5
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Solution

The correct option is B 1loge5
Given, y=5x
y=5xln5
Hence length of subtangent =yy=5x5xln5=1loge5

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