Q49 / 90 · JEE Main 2019 (12 Jan Shift 1) · Mathematics

For x>1, if 2x2y=4e2x-2y, then 1+loge⁡2x2 dydx is equal to

  • A
    loge⁡2x
  • Correct answer
    B
    xloge⁡2x-loge⁡2x
  • C
    xloge⁡2x
  • D
    xloge⁡2x+loge⁡2x

Solution

Given, 2x2y=4.e2x-2y

Taking natural logarithm on both sides, we get

2y loge2x= loge4+2x-2y

⇒2y=loge4+2x1+loge2x

Differentiating both sides with respect to x, we get

2dydx=1+loge2x.2-loge4+2x1x1+loge2x2 (Using quotient rule)

⇒1+loge2x2dydx=x.loge2x-loge2x.

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

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