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Use the Chain Rule to find dz/dt. z = xy^9 − x^2y, x = t^2 + 1, y = t^2 − 1

 just a regular calc 3 question using chain rule. not sure what im doing wrong

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Michael J. | Effective High School STEM Tutor & CUNY Math Peer LeaderEffective High School STEM Tutor & CUNY ...
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Did you substitute the equations x and y to write z in terms of t?
 
z = (t2 + 1)(t2 - 1)2 - (t2 + 1)2(t2 - 1)
 
z is now in terms of t.  You can now use chain-rule with the product rule.