Grade 12 Trigonometry Lesson 2| Reduction Formulae (More Examples)
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- เผยแพร่เมื่อ 5 ก.ค. 2024
- Simplifying trig expressions using reduction formulae. In this video we tackle past exam questions using to help you with more understanding of this section.
#mlungisinkosi #mathematics #matric
I don't want to lie what you're doing father is really helpful I have covered mathematics topics with understanding using this channel thank you sir continue doing the great work father God is with you serious 🤞❤️
Honestly speaking 😭 I'm grateful 🙏 wish I discovered this channel beginning of Term 1
We have a bit of marketing work to do…
2024 matriculant and ive been struggling but now I understand so well❤❤❤❤, ngiyabonga my favourite uncle😂
After a decade of passing my matric, I find myself doing grade 12 math and the videos so far are helpful 😊
MR N , to add onto your lesson another easy way to find the RATIOS( SIN,COS,TAN), you can put 1 inside the braket to determine the sign, eg Sin(180 -- 1) = positive 0,..... ,AND Sin(180 +1)= NEGATIVE 0,.... the key is to focus on the OUTCOME OF THE SIGN therefore making it easy to identify the quadrant of the RATIO
That’s a really nifty trick. I think you should be hired to replace me… Lol
@@MlungisiNkosi hahahaha.., i will sleep on it Sir
Yazzzz this 360° when you have a negative angle it is really helping yhooo i didn't even know tht♥️👌👌👌👌
You’re welcome
Thank you sir your videos have been really helpful, you don't miss!!! 🌑❤️
Thank you so much
For the last one my answer is positive 1/8.
🤣360 making things easier thank you 🙏🏼 sir
I agree…
Honestly speaking I gave up on writing my p2 tomorrow but looking at ur videos gave me hope
Thank you so much sir,I can now understand I just need to study and practice now
Let’s gooooo 😊
This is so helpful yhooo sir uu the best teacher😎♥️👌
Thank you 😊
extremely helpful,thank you sir
You’re welcome
your videos are very helpful. siyabonga!
You’re welcome ☺️
Your videos are very helpful,
You’re welcome
Mr nkosi we were told that we can use 270^ as it’s not part of the syllabus… on the last example
Thank you sir so much😭😭😭you simplified everything for us. But sir can we substitute cos(270-45) such that we have -sin45 instead of cos(180+45)?
Can you please exaplain why cos 270-x isn't (-sinx) and not ( +sinx)
Thank you sir❤🎉
For the first example, is the answer not positive 1, since the tangent in the numerator is negative
Sir , at 9:31 ..is it not a +2sinx instead ? because it was -sinx at the top being divided by a -1/2 then when multiplying by 2 at the top and bottom it will then be -2sinx at top then divided by a -1 which would be 2sinx ? pls correct me if I'm wrong 😢.
Greetings to you Sir was asking why dont we also multiply also the -1 that is left out after cancelling the cos
Please provide a time stamp for your question
❤❤
Life saver
You’re welcome
Sir may you please come teach at teneo coz wow your the best only now (today) im understanding and i am more confident about being able to mathematis all this time i felt dom😅
Eish… I can help them if they want me to.
@@MlungisiNkosi yah sir, please try them. A lot of us there... struggle with mathematics.
@@iambusang sad but it’s a reality 🥹
@@MlungisiNkosi...Sorry sir for the last example , I found a positive 1/8 because I think that (-) we got when dividing -cos10/cos10 , will affect the whole equation but not sin30 ONLY , or am I wrong sir?
This has been really helpful ❤️ can you also make a video of solving or evaluating trigonometry in sigma notation questions
Noted
please do the past exam papers from 2018,the graphs included November
Will look into it
Sir on the last example after cancelling cos10 in the numerator and cos10 in the denominator.
Why didn't you also cancel Sin 30 and Sin30?
I don't know if you get me
The second sin that which had a negative sign
You may do so
Thanks for this sir ❤❤❤
But how will I know if I have to make sin(330) to sin(360-30 ) and not sin(270+60) , because they are giving me a different answer. Or I just don't have to use 90 and 270?🤔😢please help me out
Ohoo sorry sir , I got it 😂🤣it is okay to use 270 and 90 just that , that sin will change to its coratio which will be cos60 and cos60 =sin 30 =1/2
Domkop me😭💔
Please don’t call yourself a domkop. I created this channel to prove that you’re not a domkop and if you were, you would not have figured it out
For the last question ,I don't really understand why the sin(270 - 10) became (- cos 10) and not (- cos 80). Isn't like co ratios?
Yes it is co-ratios. Please watch the video before this one
hi sir please when you get time teach us how do we change something into co-ratio
I did that… check the earlier lessons
would it be wrong if i expressed cos225 as cos(270 - 225) ? ( at 10:38 )
Yes that would be incorrect because 270-225 is not equal to 225
Thank u sir👏🥺
Most welcome
at 3:25, why isn’t it [ 360 - (x - 90 )]? because in lesson 1, we were subtracting from 360 and not adding to it
We can either add or subtract to get what we are looking for
This is good
You’re welcome ☺️
Please do Euclidean geometry after trigonometry 😭😭🙏
Most definitely
Please do negative angles
Did you check the video after this one?
Sir would please provide help on the last question you gave us
Will do
Thanks khalhulu babo mlungisi ,I really understand but I am always scared if I'm gonna get an A😢
You have not been given the spirit of fear. Believe in yourself and the work you have put in. All the best
Night before P2 let’s go
All the best for your exam
Since dominators are the same why won't we take them as it is ? Last example sir
Sir I didn't understand step 2 when you were multiplying by negative 1 on the third example
Please provide time stamp
Sir in the last question you said -sin 45 instead of -cos45
I apologise it an error was made
Please sir can you do chemistry 🙏
Please check under Playlists… there’s everything you need
Sir how can sin(270-10) change to cos of 10?🤔
Because it’s a co-ratio, just check the previous video
Good sir. For the first worked example I dont understand, why you changed the cos(270+x) to sin. I know that it might be Co ratios but will I be marked wrong if I don't change it
Yes it will be incorrect if you don’t change it
@@MlungisiNkosi okay I wasn't aware of the sir. Thanks.
But sir may kindly show me more co ratios so that I don't make the same mistake
That **
I just don't understand how we get 270
Hi,last example,second step how did you know that sin150 is (180-30) etc
So you must always try to represent or convert number to (90, 180, 270, 360) and a special angle
@@MlungisiNkosi ok,thank you.
Can someone tell me all the special angles😢
I really don't understand how you get those co-ratios
I’m not sure what you mean…
@@MlungisiNkosi it's good now thank you ..I think I got the hang of it
Mr nkosi we were told that we can use 270^ as it’s not part of the syllabus… on the last example
But at least you know how to use it in case you get such an example
Thank you sir so much😭😭😭you simplified everything for us. But sir can we substitute cos(270-45) such that we have -sin45 instead of cos(180+45)?
Yes you can