CSEC Maths - Trigonometry Worked Examples

[@nikitajulien5409]

For jan 2009 could i just use the cosine rule then find the inverse?

[@elliefromtt4246]

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??

[@charmainechambers9949]

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.

[@carlaalleng3433]

Where you got six from?

[@CSECMathematics]

at which point in the video?

[@CSECMathematics]

It should be 10.

[@ayannalewis8470]

Sin 0 = opp/hyp = Sin 0 30/1cross multiply MK/10 = MK = 10× sin 30°= MK = 5m

[@ayannalewis8470]

Sin 0= opp/hyp = sin 40/1cross multiply DX/15= DX 15× sin 40 = D= 9.6. Cos 0 adj/hyp=

[@c.c2373]

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?

[@CSECMathematics]

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.

[@nicholaschung5536]

for the 1st question sir.....I don't get where you got 6 when you only have 8m and 10m

[@jewel4396]

For June 1999 part 2 the answer is 65

[@ayannalewis8470]

Sin 0 opp/hyp= sin 0=6/12= sin 0.5 =0 sin (0.5)=0=3

[@c.c2373]

in the 2009 question u have 6 and there is no 6 on the diagram

[@CSECMathematics]

Yes I know. I made a mistake. Just replace the 6 with 10 in your calculations.

[@shalinilalchan4812]

Um the answers you have are wrong for Jan 2009.

[@CSECMathematics]

+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.

[@aneesaali587]

how you have 2 *8

[@CSECMathematics]

Let me know at which time in the video so I can check.

[@scarlettewhyte7481]

I don't see the 6 so which one 10 or 11

[@portmorepatrol5288]

Like u need a better camera sir. Can't make out what is on the screen... only what you writing.

[@CSECMathematics]

It's not a camera. It's a screen capturing tool. Try changing your resolution on KZbin to 720p. All my videos are recorded in HD.

[@CSECMathematics]

I also have newer videos on trigonometry

[@jenjensterling7898]

Terrythe answer is 9.2m instead of 7.2m

[@nicholaschung5536]

for the 1st question sir.....I don't get where you got 6 when you only have 8m and 10m

[@rick7122]

Man its been five years and he hasnt responded, idk if i should answer lmao

[@coveprimary9138]

Here in 2023

[@saearlman8271]

He got the 6 from in between NK