curve sketching trig problem

[nickyp]

This may be a pre calc problem...not sure but I am stuck.

Sketch the curve.
f(x) = 2x - 4sinx

I have the derivatives, mins and maxs, and concavity. what I cannot find is the zeros (x intercepts) of the function.

0 = 2x - 4sinx how do you solve this for zero?

Thanks and sorry if this is in the wrong forum, this is my first time posting here.

 

[Deleted member 4993]

This may be a pre calc problem...not sure but I am stuck.

Sketch the curve.
f(x) = 2x - 4sinx

I have the derivatives, mins and maxs, and concavity. what I cannot find is the zeros (x intercepts) of the function.

0 = 2x - 4sinx how do you solve this for zero?

Thanks and sorry if this is in the wrong forum, this is my first time posting here.

These equations cannot be solved in closed form. You'll need to estimate those (x-intercepts) through iterative methods like Newton-Raphson's method.

 

[BigGlenntheHeavy]

\(\displaystyle f(x) \ = \ 2x-4sin(x), \ look \ at \ its \ graph, \ you'll \ have \ to \ put \ restrictions \ on \ it \ as \ it \ is \ cyclic.\)

[attachment=0:25yzcn6t]fff.jpg[/attachment:25yzcn6t]

 

[nickyp]

ok. thanks
Yea I did look at the graph but I was trying to get the zeros in order to sketch it. I thought there was a way to get the zeros that I was missing??