Open Question: differentiation question.? please help..?

1:50 Publicado por Flechado16

using implicit differentiation, i need to solve:
d/dx (siny/y)

is this the answer:
((dy/dy) (ycos y-sin y)/(y^2))

the answer book is sayin:
(y(dy/dx)cos y - sin y)/y^2

how come?


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