Can someone please help me with the following problem? I have absolutely no clue as to how to do this!
Hello Nancy
In question 1, D is missing, but I assume it's where the line from C meets AB.
So, look at :
So
Now use :
, since is impossible in this case.
I think you may have written down some of the other questions wrong as well. But here are a few pointers.
2 Note that , and then express all the lengths in terms of . So:
?
Substitute all these values into , and divide through by .
I think you have written 2(b) wrong. It doesn't work out as you have written it.
3 Express and in terms of . Again, I think you haven't written the result correctly. I think it should be
The result then factorises:
4 Should there be some more information in the diagram? Have you written the result correctly?
Grandad
Sir,
Thank u sooo much for ur response! It was a great help!
Now that you have pointed this out, it turns out that the original diagrams did have some mistakes:
1) In question 2 (b), I don't think it is very clear on the pdf version but the sign between 3, cosx and sinx is a minus sign.
So, the expression is tanx = 3 - cosx - sinx
sinx + cosx - 2
2) The homework sheet says 2cos^4 x - 3cosx+1 = 0
But now that I look at it (thank u for ur help again) it is probably meant to be cos^2 x. Our teacher probably missed it (He has a habbit of doing that).
3) And yes, the C was probably meant to be a D and vice-versa. But everything else seems ok (but again, there could have been a miss print)
Thank u again!
Nancy