In implicit differentation problems it seems we treat x and y differently. For example, when we differentiate both sides of cos(x) + sin(y) = x^3 + y^3, we get -sin(x) + cos(y)y' = 3x^2 + 3y^2y'. a) Why do we get y' but but not a x'? WHy are these variables treated differently? b) How is this related to the chain rule?

Calculus: Early Transcendentals
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Chapter1: Functions And Models
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In implicit differentation problems it seems we treat x and y differently. For example, when we differentiate both sides of cos(x) + sin(y) = x^3 + y^3, we get -sin(x) + cos(y)y' = 3x^2 + 3y^2y'.

a) Why do we get y' but but not a x'? WHy are these variables treated differently?

b) How is this related to the chain rule?

 

Expert Solution
Step 1

Recall:

Chain Rule of differentiation :

   If F(x)=f(g(x)) then ,   F'(x) = df(g(x))dx = f'(g(x)).g'(x)

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