4. Let f(x) = x3 + x5, and let g be the inverse function of f. What is the value of the derivative g’(2)?
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A. –1/92 |
B. 1/92 |
C. 1/8 |
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D. 8 |
E. 92 |
Solution: The answer is C
Differentiating the equation g(f(x)) = x, and then inserting x = 1 we get