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1. Find y' if sin y + 2x^4 = e^x + 4y + xy^3 2. The...

1. Find y' if sin y + 2x^4 = e^x + 4y + xy^3

2. The width of a rectangle is decreasing at a rate of 3 cm/sec.ind its area is increasing at a rate of 40 cm?/sec. How fast is the length of the rectangle changing when its length is 4 cm and its width is 7 cm ?

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