Trigonometry Exact Values

[@isabellaisswag9490]

This video has a special place in my heart

[@artemiscarnegie]

maths genie saving our gcses

[@milliecarlin1821]

hi. this video is very helpful, it’s the only way i know how to do exact value questions. but i was wondering how you do questions that go up to like sin270 or cos180?

[@Qweeeeegame]

Will never come up in an exam

[@switchclips1292]

Angles In a triangle add up to 180 so I don't think you'll get a question above 90

[@aayushcovers8723]

Would never come up but what you do is use the graphs according to sin cos or tan and look for teh equivalent of the value you foudn for the value 90 and under

[@Qweeeeegame]

Now in a levels you will need to use sin graph and use the symmetry same with others

[@hamed3423]

Do you have to memorise the table for the exam? Please help.

[@kellykelly7785]

yes

[@hamed3423]

@@kellykelly7785 thanks kelly

[@archiesutherland6127]

it would be helpful to do so yes

[@itszara07]

Yes! (Hope I replied in time! 😭)

[@sz_7.]

@@itszara07 4 years too late

[@tnrana]

Hi, just wanted to ask isn't the value for tan(30) root 3 over 3 instead of 1 over root 3, because you have to rationalise

[@tapwater5]

you dont have to rationalise all the surds on denominators unless the questions specifies or you have to answer a question

[@K_EESHA_]

Haaaa i love it ❤ i got it at the last-minute

[@AmmarRihawi1]

do I have to remember them for my calculator exam?

[@jingle1412]

Ngl I thought that it was gonna be more complex but ok…

[@mayhem9498]

Can you do more videos like this

[@godhera5116]

Can someone explain to me how to proceed with other numbers?

[@g.a8636]

only that set of number is needed.

[@maddisonmae3675]

Your cos 45 value is wrong? I have it at 1/ root 2

[@dilly2047]

If you rationalise it (times the fraction by root 2 over root 2) you get his value. His value is correct

[@KashifHHayat]

Hi there. Very helpful ... thanks a lot! However, if I can ask, is there a mistake here. I just watched your previous video where you used 2 right-angled triangles: one equilateral with sides of 2 (length / unit) and the other with two equal sides of 1 (length / unit). Based on your first video, then sin(45) = 1 / (square root of) 2 and NOT as your video above shows. Also, cos(45) will be the same as sin(45) ... 1 / square root of 2. However, your 'table method' above shows differently! Please advise! Take care.

[@mathsgenie7808]

+Kashif H. Hayat Is it that one video says 1 over root 2 and the other days root 2 over 2? If so they are equivalent - if you type 1 over root 2 into a calculator it will simplify to root 2 over 2