If , find when .
Answer and explanation
Correct answer: D.
- Step 1: Product rule: . Step 2. At : . **Answer: . Why not the others:** is what you get if you multiply the derivatives of the two factors. is what you get if you evaluate instead. is what you get if you make an error in the product rule.
Practise more School Mathematics.
Free questions with an explanation for every one, and full timed Uzbekistan National Certificate (Milliy sertifikat) mock tests.