You are Here: Home >< Maths

# Trigonometry helppp watch

1. solve the equation for 0<Ɵ<360 : tan^^2 Ɵ=2 and 3cos^^2 Ɵ 2cos Ɵ -1 = 0 I'm honestly baffled
2. Is there an equation which links sec^2Ɵ to tan^2Ɵ? As secƟ = 1/cosƟ.
3. (Original post by Sweetpotayto)
solve the equation for 0<Ɵ<360 : tan^^2 Ɵ=2 and 3cos^^2 Ɵ 2cos Ɵ -1 = 0 I'm honestly baffled
Are these two separate questions? And is this GCSE further maths? It's not normal GCSE maths.

The second equation isn't clear, there looks to be a sign missing.
4. (Original post by Notnek)
Are these two separate questions? And is this GCSE further maths? It's not normal GCSE maths.

The second equation isn't clear, there looks to be a sign missing.
ohhh sugar, yeah it's further maths and there are 2 different equations... the last one is 3cos^^2 + 2cos Ɵ -1 = 0
5. (Original post by Sweetpotayto)
ohhh sugar, yeah it's further maths and there are 2 different equations... the last one is 3cos^^2 + 2cos Ɵ -1 = 0
Okay so for the first equation, do you have any ideas for how to solve it?

It's best that you say this is further maths if you post it as a GCSE question otherwise people will be confused. Also, please post maths questions in the Maths forum - I've moved this one for you.
6. I know tanƟ is either square root 2 or -2

so 54.7 or -54.7 and then that's where I get baffled.

But I know that it's going to be 180 + 54.7 = 234.7

so I can do it for +2 but not -2 ... if that makes any sense
7. (Original post by Sweetpotayto)
I know tanƟ is either square root 2 or -2

so 54.7 or -54.7 and then that's where I get baffled.

But I know that it's going to be 180 + 54.7 = 234.7

so I can do it for +2 but not -2 ... if that makes any sense
You'd have to tell me which method you use to find trig solutions e.g. CAST, the graph etc.

But for tan, adding/subtracting 180 will always get you solutions so you can just do this i.e. add 180 to -54.7 for a solution in the range and then add 180 again...
8. I just realised that for the - root 2 it's 125.3 so 180+ 125.3 is 305.3 .... so the solutions are 54.7, 125.3, 234.7 and 305.3?

### Related university courses

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: March 1, 2018
Today on TSR

### Top unis in Clearing

Tons of places at all these high-ranking unis

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