- #1
mohlam12
- 154
- 0
hey everybody
i need help solving this.. i have e function a(x) = x - sin x x belongs to -pi/2, pi/2
i need to demonstrate that for x>=0, a(x)>=0
i tried to derivate the function to get 1-cosx which is positive, therefore a(x) is positive too.. but then i'd face problems when it comes to demonstrating the same thing for x<0
any hints ?!
thanks
i need help solving this.. i have e function a(x) = x - sin x x belongs to -pi/2, pi/2
i need to demonstrate that for x>=0, a(x)>=0
i tried to derivate the function to get 1-cosx which is positive, therefore a(x) is positive too.. but then i'd face problems when it comes to demonstrating the same thing for x<0
any hints ?!
thanks