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# Trigonometric Identities Help!! Watch

1. (Original post by RDKGames)
Use the identity to get sin squared in terms of cos squared.
Right so this is what I've got:
1-cos^2/1-cosx = 1+cosx
2. (Original post by ellahick)
RDK games, he/she doesn't do maths - common sense here "ALEX"
I don't know what's more confusing: the maths or your weird replies
3. (Original post by Alex.trin)
Are you by any chance religious?
I must say i find my religious beliefs highly irrelevant to your maths problems however for the sake of it I will admit I'm a member of the church of england who also dabbles in Islam and all things Allah
4. (Original post by Alex.trin)
Right so this is what I've got:
1-cos^2/1-cosx = 1+cosx
This one's a bit trickier than the questions that you've done so far.

You need to factorise the numerator by using difference of two squares. Can you do that?
5. (Original post by Alex.trin)
I don't know what's more confusing: the maths or your weird replies
I don't know whats more original, the idea of heaven and afterlife or your comments
6. (Original post by notnek)
This one's a bit trickier than the questions that you've done so far.

You need to factorise the numerator by using difference of two squares. Can you do that?
Oh yes I see it now. Is it (1-cosx)(1+cosx) on the top?
7. (Original post by ellahick)
I must say i find my religious beliefs highly irrelevant to your maths problems however for the sake of it I will admit I'm a member of the church of england who also dabbles in Islam and all things Allah
Unfortunately this thread doesn't regard religion so please can you make your religious beliefs useful somewhere else?
8. (Original post by alex.trin)
oh yes i see it now. Is it (1-cosx)(1+cosx) on the top?
is it not obvious you retarded child of satan
9. (Original post by Alex.trin)
Unfortunately this thread doesn't regard religion so please can you make your religious beliefs useful somewhere else?
Any chatrooms you would recommend?/
10. (Original post by notnek)
This one's a bit trickier than the questions that you've done so far.

You need to factorise the numerator by using difference of two squares. Can you do that?
Wow I did it. 2 questions lefts!!
11. (Original post by ellahick)
Any chatrooms you would recommend?/
http://www.thestudentroom.co.uk/forumdisplay.php?f=133
12. (Original post by notnek)
This one's a bit trickier than the questions that you've done so far.

You need to factorise the numerator by using difference of two squares. Can you do that?
Ok so I'm on question 7 now. I'm up to 1+sinx/cosx = cosx/1-sinx. I would love some help please !
13. (Original post by Alex.trin)
Ok so I'm on question 7 now. I'm up to 1+sinx/cosx = cosx/1-sinx. I would love some help please !
Try starting from the RHS and multiplying the top and bottom by 1+sinx
14. (Original post by ValerieKR)
Try starting from the RHS and multiplying the top and bottom by 1+sinx
Ok so on the RHS I've now got cosx+cosxsinx/1-sin^2x. Is this right and where do I go from now?
15. Has your teacher showed you how to set these out?

If you are starting with the left hand side then write LHS = ....... and work on that to eventually get what is on the RHS.

As others have said do not put them equal until you have shown they are.

I'm quite surprised your teacher is doing this so early in the year ... [I'm a teacher and would not start with this yet]
16. (Original post by Alex.trin)
Ok so I'm on question 7 now. I'm up to 1+sinx/cosx = cosx/1-sinx. I would love some help please !
(Original post by ValerieKR)
Try starting from the RHS and multiplying the top and bottom by 1+sinx
NNOOOOOOOOOOOOOOOOOO.!!!!!

Valerie, same pitfall I made. Look onto the first page.

Alex, go back a step, on the LHS, multiply top and bottom by cosx. Express denominator in terms of sinx, and use difference of two squares again. Factors cancel and you have it.
17. (Original post by Muttley79)
Has your teacher showed you how to set these out?

If you are starting with the left hand side then write LHS = ....... and work on that to eventually get what is on the RHS.

As others have said do not put them equal until you have shown they are.

I'm quite surprised your teacher is doing this so early in the year ... [I'm a teacher and would not start with this yet]
Well we all did further maths in June so we're just recapping some of the A* content which is likely to appear in the AS before we forget it completely.
18. (Original post by RDKGames)
NNOOOOOOOOOOOOOOOOOO.!!!!!

Valerie, same pitfall I made. Look onto the first page.

Alex, go back a step, on the LHS, multiply top and bottom by cosx. Express denominator in terms of sinx, and use difference of two squares again. Factors cancel and you have it.
I've gone wrong somewhere: cosx + cosxsinx/1-sin^2x = cosx/1-sin^2x
19. (Original post by RDKGames)
Valerie, same pitfall I made. Look onto the first page.
You can start from either side, so long as you end up at the other
20. (Original post by Alex.trin)
I've gone wrong somewhere: cosx + cosxsinx/1-sin^2x = cosx/1-sin^2x
You had and now refer back to my comment on what to do.

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