Maharashtra State BoardHSC Commerce 12th Board Exam
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Find dy/dx if y = e^x^x - Mathematics and Statistics

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Sum

Find `"dy"/"dx"`if, y = `"e"^("x"^"x")`

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Solution

y = `"e"^("x"^"x")`

Taking the logarithm of both sides, we get

log y = log `"e"^("x"^"x") = "x"^"x" log "e"`

∴ log y = `"x"^"x"`

Differentiating both sides w.r.t.x, we get

`1/"y" * "dy"/"dx" = "d"/"dx" ("x"^"x")`    .....(i)

Let u = `"x"^"x"`

Taking logarithm of both sides, we get

log u = `log "x"^"x" = "x" log "x"`

Differentiating both sides w. r. t. x, we get

`1/"u" * "du"/"dx" = "x" * "d"/"dx" (log "x") + log "x" * "d"/"dx"("x")`

∴ `1/"u" * "du"/"dx" = "x" * 1/"x" + log "x" * (1)`

∴ `1/"u" * "du"/"dx"` = 1 + log x

∴ `"du"/"dx" = "u"(1 + log "x")`

∴ `"du"/"dx" = "x"^"x"`(1 + log "x")    .....(ii)

Substituting (ii) in (i), we get

`1/"y" * "dy"/"dx" = "x"^"x"`(1 + log x)

∴ `"dy"/"dx" = "y"  "x"^"x" (1 + log "x") = "e"^("x"^"x") * "x"^"x" (1 + log "x")`

Concept: The Concept of Derivative - Derivatives of Logarithmic Functions
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