Question

Which equation is represented by the intersection of the graphs below?



A. sec x=-1
B. tan x=-1
C. sin x=-1
D. cos x=-1

Answer 1

Do you know what the red graph in the picture is of?

Answer 2

its either c or d

Answer 3

no I don't

Answer 4

Well, I guess an easy way to test if it's C or D is to see if sin(0) or cos(0) is 0 (the red graph touches the point (0,0)

Answer 5

sin(0) = 0, and cos(0) = 1, which you could see by unit circle or calculator.
So, sine sounds like the best candidate. :)

Answer 6

thank you !

Answer 7

You're welcome! :)