Please help me figure out what is wrong with the way Ive written the power rule in the following code. It is incorrect.(see last line of code)

Symbolic Differentiationrkt-DrRacket e Edit View Language Racket Insert labs Help mbolic Differentiation_ (define-,-+67 ang racket symbolic DIfterentiation assignment define (diff x expr) differentiation function that 1 t produces the derivacive of a given function with respect to a given variable (if (not (if (1ist? expr)) (equal? x expr) 0) ; d/dx (x) 1, let (operation (car expr)) expr is d/dx (e) toperation v (u (cadr expr)) (v (caddr expr) )) case operation ((-) (list - (diff x u) (dift x viDddx () (list dudx Hd/daitterence rule /dx(dd du/dx product rule (list v v))) Symbolic Differentiationrkt-DrRacket e Edit View Language Racket Insert labs Help mbolic Differentiation_ (define-,-+67 ang racket symbolic DIfterentiation assignment define (diff x expr) differentiation function that 1 t produces the derivacive of a given function with respect to a given variable (if (not (if (1ist? expr)) (equal? x expr) 0) ; d/dx (x) 1, let (operation (car expr)) expr is d/dx (e) toperation v (u (cadr expr)) (v (caddr expr) )) case operation ((-) (list - (diff x u) (dift x viDddx () (list dudx Hd/daitterence rule /dx(dd du/dx product rule (list v v)))