Asked by Becky

Use the Chain Rule to find ∂z/∂s and ∂z/∂t.
z = tan(u/v), u = 7s + 4t, v = 4s − 7t
Answered by Steve
The answer is not too complicated. If you go to wolframalpha.com and enter

d/ds (tan((7s+4t)/(4s-7t))

and then click the "show steps" button, you can see the steps taken.
Answered by Becky
thank you!!!!!!
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