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d/dx tan(x) at x = . 3. If f(x) = 5x4 + 18x3 + 14x2 + 8, use the definition of a derivative to create a limit and simplify the derivative at x = -1. 6 4. If f(x) = 5x4 + 18x3 + 14x2 + 8, use the definition of a derivative to create a limit and simplify the derivative at x = -3.-138 5. ................
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