ISRO Mechanical & Aerospace 2009 - Question 76

All ISRO Mechanical & Aerospace papers | ISRO Mechanical & Aerospace 2009

If u = log(tanx + tany), then sin2x du/dx + sin2y du/dy is

  • A. 1
  • B. -2
  • C. 2
  • D. -1

Answer: C. 2

Explanation: Using partial derivatives, the expression evaluates to 2.

| | All questions of ISRO Mechanical & Aerospace 2009