x Turn on thread page Beta
 You are Here: Home >< Maths

# Can you solve this? watch

1. 2sint/1-4cost = -1/2

what is t

2. (Original post by 10614LW)
2sint/1-4cost = -1/2

what is t

Yes, I can

What have you tried
3. Begin by multiplying both sides by
(1 - 4cos(t) )
Use your algebra knowledge from there. You'll eventually need to use/rearrange and sub in a trig identity :
Remember sin^2(t) + cos^2(t) = 1 ?
Take it on from there...

Out of interest, how do you guys write really neat maths on tsr?

Posted from TSR Mobile
4. (Original post by Jaydude)
Begin by multiplying both sides by
(1 - 4cos(t) )
Use your algebra knowledge from there. You'll eventually need to use/rearrange and sub in a trig identity :
Remember sin^2(t) + cos^2(t) = 1 ?
Take it on from there...

Out of interest, how do you guys write really neat maths on tsr?

Posted from TSR Mobile
On my phone, but there is a link to LaTeX for TSR
5. (Original post by Jaydude)
Begin by multiplying both sides by
(1 - 4cos(t) )
Use your algebra knowledge from there. You'll eventually need to use/rearrange and sub in a trig identity :
Remember sin^2(t) + cos^2(t) = 1 ?
Take it on from there...

Out of interest, how do you guys write really neat maths on tsr?

Posted from TSR Mobile
Not sure why you are suggesting that identity .... Did you then use a disguised quadratic

I went with harmonic firm
6. (Original post by 10614LW)
2sint/1-4cost = -1/2

what is t

Start by clearing the fractions, then consider what we can do with
7. (Original post by Jaydude)
Begin by multiplying both sides by
(1 - 4cos(t) )
Use your algebra knowledge from there. You'll eventually need to use/rearrange and sub in a trig identity :
Remember sin^2(t) + cos^2(t) = 1 ?
Take it on from there...

Out of interest, how do you guys write really neat maths on tsr?

Posted from TSR Mobile
Ignore that, somehow thought 2 / 0.5 = 1 :P
But you can see where that leads to too

Posted from TSR Mobile
8. clear the denominators, and get trig terms on LHS.

you will have something of the form:

then convert to something of the form:

depends on the range you want to solve for..0 to implies just one result
9. (Original post by Arvind54)
see the attached file.
I am certainly not offended and I will not be reporting your post but many others might as it is against forum rules to post full solutions
10. (Original post by Arvind54)
see the attached file.
As TeeEm has pointed out ... The forum guidelines ask us to not post full solutions ... Can you edit your post please

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: January 23, 2015
Today on TSR

### Happy St Patrick's day!

How are you celebrating?

### Stay at sixth form or go to college?

Discussions on TSR

• Latest
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

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