Q71 / 150 · MHT CET 2016 · Mathematics

If log10⁡x2-y2x2+y2=2, then dydx= _______

  • Correct answer
    A
    -99x101y
  • B
    99x101y
  • C
    -99y101x
  • D
    99y101x

Solution

Given, log10⁡ x2-y2x2+y2=2
⇒   x2-y2x2+y2=100
⇒   x2-y2-100x2-100y2x2+y2=0
⇒  -99x2-101y2x2+y2=0
⇒   99x2+101y2=0
⇒ 2×99x+2×101 ydydx=0
⇒  dydx=-99x101y

Hence, the correct answer is option: 'A'.

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