# solving trignometric equations help

Watch
Announcements
#1
i started with taking sin to the other side to get Pi6
and then solved like usual but my answers were either outside range or doesnt match with the answers
Last edited by nusrxxt; 1 month ago
0
1 month ago
#2
Let x=theta. Since 0<x<pi, 0<2x<2pi and therefore 3/8pi< 2x+3/8pi < 19/8pi. Then just use sin =sin(pi-x) =sin(x+2pi) and you should be good
1
1 month ago
#3
--> Make new theta
--> Find all solutions within the new range (using the cast diagram, or other graphs)
--> Rearrange get theta only
--> Check if the final solution is within the original range

Hope this helps!
Last edited by sararah04; 1 month ago
2
1 month ago
#4
(Original post by sararah04)
Hope this helps!
Please edit or delete your post - it is against forum rules to post full solutions!

Thanks
0
#5
(Original post by sararah04)
Attachment 1026950
Hope this helps!
Thankyou so much !
0
#6
(Original post by tej3141)
Let x=theta. Since 0<x<pi, 0<2x<2pi and therefore 3/8pi< 2x+3/8pi < 19/8pi. Then just use sin =sin(pi-x) =sin(x+2pi) and you should be good
thankyouu
0
1 month ago
#7
(Original post by davros)
Please edit or delete your post - it is against forum rules to post full solutions!

Thanks
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### What support do you need with your UCAS application?

I need help researching unis (19)
15.08%
I need help researching courses (8)
6.35%
I need help with filling out the application form (7)
5.56%
I need help with my personal statement (47)
37.3%
I need help with understanding how to make my application stand out (33)
26.19%
I need help with something else (let us know in the thread!) (3)
2.38%
I'm feeling confident about my application and don't need any help at the moment (9)
7.14%

View All
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.