sen x + cos x = 0
sen x = - cos x
(sen x/cos x) = -1
tg x = -1
In the interval [0, pi], we have:
tag x = tag(3.pi/4)
x = 3.pi/4
I hope you understand.
Find the absolute extrema:
Okay. So first I found the derivative of
Then, to find the critical points I must set this to zero.
But I'm a little confused. If they were multiplying, I would do: either cos x = 0 or sin x = 0, right ? But since they're being added, I'm not really sure how to get x = ? so I can continue with the question.