Question

sin x=-1 or sin x=0, which one equals k pie?

Answer 1

Sin is the y coordinate of the point in the circle of radius 1, pi not pie, is half a turn, think about it.
It is counterclockwise

Answer 2

im still not sure how they got kpi though? like how am i supposed to solve that

Answer 3

each k is natural, so each k gives a half turnin each half turn the y coordinate is 0, so it can only be 0. (see the drawing and try to see why the sin is the y coordinate and cos the x coordinate)

Answer 4

im sorry i really have no idea what your talking about

Answer 5

ok, lets try another way.
Do you agree that sin 0 =0
sin pi = 0
sin 2pi=0?

Answer 6

If you dont, see that imediatly let me know

Answer 7

yes i do see that

Answer 8

Ok, for cossine is 1 instead of 0, but that doesnt matter.
Now, that k that multiplies pi, is meant to be seen as {0, 1, 2, 3, 4, ...}
what that is saying, is that, x=kPI, then it would be sin 0PI=?
sin 1PI=?
sin 2PI=?

Answer 9

I think your problem was interpreting the question, because if you see that all of those need to be 0, then your question is answered by yourself. Did you undertand what I said on the previous post?

Answer 10

I think i figured it out, I'm pretty sure its supposed to be sin x=0 that goes with k pi

Answer 11

Yes, x=k pi and (sin x)=0.

Answer 12

thank you!