Question

For 0<=x<=360, how many roots does the equation cos^(2)x-sin^(2)x=1 have?

1-2sin^(2)x=1
-2sin^(2)=0

....what's the world going on?

Answer 1

-2sin^(2)=0 ---->sin x = 0

Answer 2

0,180,360?

Answer 3

yes.

Answer 4

3roots?

Answer 5

yes.

Answer 6

thank you hartnn, my homework is finished :)

Answer 7

great! most of it was done by yourself :)
i am very glad to help smart girl like you :)

Answer 8

i am not smart :)
if i am smart, i wouldn't post that easy question-_-

Answer 9

it happens! its ok.