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I have posted a link there to this thread so the OP can see my work.Differentiate the following equation with respect to x. (a) y^x (b)x^y= sin x?

Differentiate the following equation with respect to x. (a) y^x (b)x^y= sin x?

given that x^n + y^n = 1, show that d2y/dx2 = -(n-1)x^(n-2)/ y^(2n-1)