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Let y be an implicit function of x defined by x^2x − 2x^x coty − 1 = 0. Then y′(1) equals

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in Limit, continuity and differentiability by (41.5k points)

Let y be an implicit function of x defined by x2x − 2xx coty − 1 = 0. Then y′(1) equals

(A) − 1

(B) 1

(C) log 2

(D) − log 2

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Answer is (A) − 1 

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