Evaluate the derivative of (tan⁻¹x + cot⁻¹x) with respect to x.
Evaluate the derivative of (tan⁻¹x + cot⁻¹x) with respect to x.
- A. 1 / (1 + x²)
- B. 2 / (1 + x²)
- C. 0
- D. x
Answer: C) 0
Explanation: tan⁻¹x + cot⁻¹x = π/2 (a constant) for all real x. The derivative of a constant is 0.
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