You are Here: Home >< Maths

# Trigonometry question Watch

1. Solve the equation 2sin^2theta = costheta + 2 for values between 0 and 360 degrees.

So the identities are:

sin^2theta + cos^2theta

tantheta=sintheta/costheta

Any help as to how this can be solved would be very much appreciated, thanks
And sorry for the lack of the use of latex!
2. You are having problems as part of your first identity is missing. This is the one you want to use.
3. (Original post by x-Sophie-x)
Solve the equation 2sin^2theta = costheta + 2 for values between 0 and 360 degrees.

So the identities are:

sin^2theta + cos^2theta

tantheta=sintheta/costheta

Any help as to how this can be solved would be very much appreciated, thanks
And sorry for the lack of the use of latex!
You want a quadratic in cos

4. You're both analogous to Speedy Gonzales
5. (Original post by Indeterminate)
You want a quadratic in cos

What do you mean by that?

So far I've got:

2(1-cos^2theta)=costheta +2
2-2cos^2theta=costheta +2
-2cos^2theta=costheta

Where do I go after that?
6. (Original post by Felix Felicis)
You're both analogous to Speedy Gonzales
I'm sorry, but what?
7. (Original post by x-Sophie-x)
What do you mean by that?

So far I've got:

2(1-cos^2theta)=costheta +2
2-2cos^2theta=costheta +2
-2cos^2theta=costheta

Where do I go after that?
Get everything on one side and factorise
8. (Original post by x-Sophie-x)
I'm sorry, but what?
Nevermind, I was referring to Indeterminate and Mr M xD In response to your last question, you have a quadratic in costheta, solve how you normally would
9. (Original post by x-Sophie-x)
I'm sorry, but what?
He means that we were too quick (comparison to speedy gonzales)
10. (Original post by Felix Felicis)
Nevermind, I was referring to Indeterminate and Mr M xD In response to your last question, you have a quadratic in costheta, solve how you normally would
Oh I see.

And I have no idea what you mean by that.

costheta +2cos^2theta=0
costheta(1+2costheta)=0

But how would that help me in any way?
11. (Original post by Indeterminate)
He means that we were too quick (comparison to speedy gonzales)
Ah right.
12. (Original post by x-Sophie-x)
Oh I see.

And I have no idea what you mean by that.

costheta +2cos^2theta=0
costheta(1+2costheta)=0

But how would that help me in any way?
ab = 0 means a = 0 or b = 0

Arriba! Arriba!
13. (Original post by x-Sophie-x)
Oh I see.

And I have no idea what you mean by that.

costheta +2cos^2theta=0
costheta(1+2costheta)=0

But how would that help me in any way?
You have or
14. ^^beat me to it
15. (Original post by Mr M)
ab = 0 means a = 0 or b = 0

Arriba! Arriba!
And again! xD
16. (Original post by Felix Felicis)
And again! xD
I see what you meant by MrM now, I hadn't a clue who he was.
17. (Original post by x-Sophie-x)
I see what you meant by MrM now, I hadn't a clue who he was.
My fame precedes me.

18. (Original post by Felix Felicis)
You have or
Oh yeah. Funny how I didn't see that, thanks

It's annoying how you know the answer to every maths question though :P
19. (Original post by Mr M)
My fame precedes me.

Haha. Sorry
20. (Original post by x-Sophie-x)
Oh yeah. Funny how I didn't see that, thanks

It's annoying how you know the answer to every maths question though :P
Jelly?

Spoiler:
Show
Ha, I'm still merely an infant in the field of mathematics and have barely scratched the surface

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 5, 2013
Today on TSR

### Am I pregnant?

...or just paranoid?

### A robot wrote Harry Potter?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

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

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

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

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.