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If y = x(sinx)x(sinx)x...∞, then dydx at x = ππ2 is equal to ______. -

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Question

If y = `x^((sinx)^(x^((sinx)^(x^(...∞)`, then `(dy)/(dx)` at x = `π/2` is equal to ______.

Options

  • 0.00

  • 1.00

  • 2.00

  • 3.00

MCQ
Fill in the Blanks

Solution

If y = `x^((sinx)^(x^((sinx)^(x^...∞)`, then `(dy)/(dx)` at x = `π/2` is equal to 1.00.

Explanation:

y = `x^((sinx)^y)`

⇒ ℓny = (sinx)yℓnx

⇒ ℓny = `e^(yℓn(sinx)).ℓnx`

⇒ `1/y.(dy)/(dx) = 1/xe^(yℓn(sinx)) + ℓnx.e^(yℓn(sinx)) xx (y. 1/sinx . cosx + y^'ℓn(sinx))`

⇒ `1/y (dy)/(dx) = 1/(π/2) + 0`

⇒ `(dy)/(dx)` = 1

Since at x = `π/2`, y = `π/2`

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