lim x tends to pi/2 cos 3x + 3cos x/ (pi/2 - x )^3

limxπ2cos3x+3cosxπ2-x3=limxπ24cos3x-3cosx+3cosxπ2-x3=limxπ24cos3xπ2-x3=4limxπ2sin3π2-xπ2-x3=4limxπ2sinπ2-xπ2-x3=4×13                                  limx0sinxx=1=4

  • 3
Infinity
  • 1
What are you looking for?