the question from 1999 where the asked to find the size of the angle EDF could i just use the cosine rule since the triangle already has both sides and an angle??
good morning, sir, just a quick question. What if the 60 degree is below the 40 degrees is it the same way to work it out? sorry i have never done math so am now trying it.
i realize u do some short hand work when it comes to sine and cosine rule so am asking can i calculate it like how u do in exam and still get my full marks?
I'm not sure what you mean by "short hand", but if you follow what I do you will get full marks. Include all your steps so that if you make a calculation error you will still get most of the marks.
+nickelback 101 Thanks for feedback. I must have been sleeping. I was supposed to use 10m instead of 6 m. Just follow the method for now. I will fix the video in time.
![Sine Cosine and Tangent... How? [Exam questions]](/img/n.gif)
For jan 2009 could i just use the cosine rule then find the inverse?
the question from 1999 where the asked to find the size of the angle EDF could i just use the cosine rule since the triangle already has both sides and an angle??
good morning, sir, just a quick question. What if the 60 degree is below the 40 degrees is it the same way to work it out?
sorry i have never done math so am now trying it.
Sin 0 = opp/hyp = Sin 0 30/1cross multiply MK/10 = MK = 10× sin 30°= MK = 5m
Sin 0= opp/hyp = sin 40/1cross multiply DX/15= DX 15× sin 40 = D= 9.6. Cos 0 adj/hyp=
for the 1st question sir.....I don't get where you got 6 when you only have 8m and 10m
i realize u do some short hand work when it comes to sine and cosine rule so am asking can i calculate it like how u do in exam and still get my full marks?
I'm not sure what you mean by "short hand", but if you follow what I do you will get full marks. Include all your steps so that if you make a calculation error you will still get most of the marks.
Where you got six from?
at which point in the video?
It should be 10.
Sin 0 opp/hyp= sin 0=6/12= sin 0.5 =0 sin (0.5)=0=3
For June 1999 part 2 the answer is 65
in the 2009 question u have 6 and there is no 6 on the diagram
Yes I know. I made a mistake. Just replace the 6 with 10 in your calculations.
Um the answers you have are wrong for Jan 2009.
+nickelback 101 Thanks for feedback. I must have been sleeping. I was supposed to use 10m instead of 6 m. Just follow the method for now. I will fix the video in time.
how you have 2 *8
Let me know at which time in the video so I can check.
I don't see the 6 so which one 10 or 11
Like u need a better camera sir. Can't make out what is on the screen... only what you writing.
It's not a camera. It's a screen capturing tool. Try changing your resolution on TH-cam to 720p. All my videos are recorded in HD.
I also have newer videos on trigonometry
8:05 gave me a headache
Terrythe answer is 9.2m instead of 7.2m
for the 1st question sir.....I don't get where you got 6 when you only have 8m and 10m
Man its been five years and he hasnt responded, idk if i should answer lmao
Here in 2023
He got the 6 from in between NK