## Luigi0210 2 years ago How would I start this? Tangent line problem.

1. Luigi0210
2. myininaya

You to find when f'=0

3. Luigi0210

Oh, alright, seems simple enough, thanks!

4. myininaya

Did you ever find f'?

5. Luigi0210

It would be $\LARGE f'(x)=2cosx+2sinxcosx$ right?

6. myininaya

right now set that =0 and solve for x

7. myininaya

$2\cos(x)(1+\sin(x))=0$

8. myininaya

Solve both equations: cos(x)=0 1+sin(x)=0

9. Luigi0210

And that'll give me x, to plug in and find y right?

10. myininaya

yep once you get x here make sure you plug into f(x) to get the corresponding y for each x in that domain given.

11. Luigi0210

Alright, thanks again myininaya :)