If x2 + y2 = 225 and dy/dt = 4, find dx/dt when y = 9.

1.	If x2 + y2 = 225 and dy/dt = 4, find dx/dt when y = 9.
Answer» If x²+ y²= 225 and dy/dt = 4, find dx/dt when y = 9. Solution:

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