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# Cartesian Equations. watch

1. Graph has parametric equations:

Show that the cartesian equation of the curve is

I have no idea how to do it. I got when I tried it. I subbed into y after expanding y to get that but its obviously not correct.
2. I don't know how you did that

Consider the expansion of sin (A+B) for the left hand side and you should have Psin t + Qcos t on the right when you've subbed in x = sin t
3. i'll get right on the case
4. You need to use the identity for sin(a+b)! It comes out straight away.

Edit: If you didn't realise, sin(t+pi/6) is not equal to sin(t) + sin(pi/6)...
5. Oh god not those sorts of questions

Ok, I'll look up how you do those again and do it then. Thank you
6. [Mod edit: Please don't post full solutions. Read the posting guide at the top of the thread list.]
7. sorry.
8. (Original post by Loz17)
Graph has parametric equations:

Show that the cartesian equation of the curve is

I have no idea how to do it. I got when I tried it. I subbed into y after expanding y to get that but its obviously not correct.
I did the full working out on the revision thread a while back
9. (Original post by little_wizard123)
You need to use the identity for sin(a+b)! It comes out straight away.

Edit: If you didn't realise, sin(t+pi/6) is not equal to sin(t) + sin(pi/6)...
Yea I remember that from C3.
(Original post by JChoudhry)
I did the full working out on the revision thread a while back
I know but I didn't fukky understand it and I need to learn how to work this out so I am prepared for an exam situation. I Just realised I need to be somewhere so I'll prob use yours again later.
10. fukky

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