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प्रश्न
Differentiate the function with respect to x:
`(sin x - cos x)^((sin x - cos x)), pi/4 < x < (3pi)/4`
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उत्तर
Let, y = `(sin x- cos x)^((sin x – cos x))`
Taking logarithm on both sides,
log y = log (sin x – cos x) (sin x – cos x)
log y = (sin x – cos x) log (sin x – cos x) ...[∵ log mn = n log m]
On differentiating with respect to x,
`1/y dy/dx = (sin x - cos x) d/dx log (sin x - cos x) + log (sin x - cos x) d/dx (sin x - cos x)`
= `(sin x - cos x) xx 1/(sin x - cos x) d/dx (sin x - cos x) + log (sin x - cos x)(cos x + sin x)`
= (cos x + sin x) [1 + log (sin x − cos x)]
∴ `dy/dx` = y (cos x + sin x) [1 + log (sin x − cos x)]
= `(sin x - cos x)^((sin x - cos x)) (cos x + sin x)[1 + log (sin x- cos x)]`, sin x > cos x
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