what is the horizontal tangent line of f(x) = x + 2sinx

Question

I am very confused as to what to do after i find the derivative. I found the derivative to be 1 + cosx but I dont know where to go from there

Answer 1

You're missing information. You need at least the x or y value to get Lt or Ln, as shown below.

 

f(x)	x+2sin(x)
f'(x)	1+2cos(x)
Line Tangent:
Lt(x1,y1)=	y-y1=m(x-x1)
Line Normal:
Ln(x1,x2)=	y-y1=(-1/m)(x-x1)

 

 

Answer 2

IDK I DONT KNOW SRRY