13. x cos2 y dx + tan y dy = 0.

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Q: A. A. Find if x = 2t4 - 4t² and y = t4 - 4t. dx t²-t+1 2t(t+1) B. t² +t+1 2t(t+1) Find f'(t) if f(t)…

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A: Here is the solution:

Q: (a) How long will it take an investment to double in value if the interest rate is 4% compounded…

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