Thread: Solving trigonometric equatio

Hello, could someone please help me. I couldnt work out these questions.

I have to solve X within the domain 0 deg ≤ X ≤ 360 deg (X = pheta (degrees))

1) tan X = -1
2) sin X = -1/2
3) cos X = 0
4) cos X = -1/2

Thank you.

You trigonometric inverses and then multiply by (180/pi)

Originally Posted by tom_asian

1) tan X = -1

Does that make sense?

Do the same with the others.

These are fundamental trigonometric equations.



Then find the values of for which and then multiply by

by the way, it's "theta"


did you get the questions done ok?

Originally Posted by Jhevon

by the way, it's "theta"


did you get the questions done ok?

I can do the questions now. thanks.. although i dont know what is "arc"

Originally Posted by tom_asian

I can do the questions now. thanks.. although i dont know what is "arc"

"arc" as it is used here just means "inverse"

so arctan(x) means the inversed tangent of x or as you may know it as

Re:

Originally Posted by qbkr21

Re::d

ahh... thanks..

so thats another way to call it. I just call it sin inverse, etc....

Originally Posted by tom_asian

ahh... thanks..

so thats another way to call it. I just call it sin inverse, etc....

yes