Differential calculas

Question

find the critical numbers and stationary points of the function

f(θ)=θ+sin θ  in{0,2π}
 

Answer 1

 

given that n=pi,
f(x)=x+sin(x)		[0,2pi]
f'(x)=1+cos(x)		[0,2pi]
1+cos(x)=0
cos(x)=-1
x=pi

Answer 2

Find y_2; if y= e^-1/x