junior meteor
ive noticed that in a lot of questions, dividing by cos theta or sin theta requires you to consider the possibility that sin or cos theta = 0, however in this question, when dividing by cos theta, a set of solutions is apparently not removed. can anyone explain this mechanism to me???
coarse mulch
ive noticed that in a lot of questions, dividing by cos theta or sin theta requi...
the cos never got removed from the equation
you only consider it to be =0 if it was factorised out of the equation @junior meteor
like if you had cos^2x + cosx=0
then cosx(cosx + 1) = 0
so cosx=0 or cosx + 1 = 0
coarse mulch
like if you had cos^2x + cosx=0
then cosx(cosx + 1) = 0
so cosx=0 or cosx + 1 = ...
dividing by cos here would get rid of it completely
however in sin/cos the cos is still there it's just been moved around
junior meteor
dividing by cos here would get rid of it completely
however in sin/cos the cos i...
you're a life saver
thank you so much
coarse mulch
np garlic flatbread with cheese & b
if you have maths questions you can ask me in redacted😊
turbid ivy
I love you even more now
Just for a point of interest, you can solve this using R-conversion / harmonic identity.
$$ \sqrt{29} \sin\left(2x - 20^\circ + \arctan\left(\frac{2}{5}\right)\right) = 0 $$
fathom blazeBOT
HM
visual hamlet
i kinda like harmonic identity more
it just doesn't mess with the dividing and cancelling
turbid ivy
i kinda like harmonic identity more
yeah
junior meteor
Just for a point of interest, you can solve this using R-conversion / harmonic i...
do you learn this in year 2?
turbid ivy
do you learn this in year 2?
yeah , chap 7
junior meteor
yeah , chap 7
alright thanks a lot, cant wait for it I think it will make it a lot easier
turbid ivy
alright thanks a lot, cant wait for it I think it will make it a lot easier
dw, trig is soo nices. probly my fav topic.
and cg50 just makes even better sometimes
junior meteor
dw, trig is soo nices. probly my fav topic.
I'll admit its very satisfying when you correct results
turbid ivy
I'll admit its very satisfying when you correct results
yeah , but knowing answer at start with cg50 and then proving it , feels even better
junior meteor
yeah , but knowing answer at start with cg50 and then proving it , feels even be...
cg50 isnt used at alevel right?
coarse mulch
cg50 isnt used at alevel right?
you can use it
turbid ivy
cg50 isnt used at alevel right?
it is
coarse mulch
you can use it
not a requirement at all though
coarse mulch
alright thanks a lot, cant wait for it I think it will make it a lot easier
if it's = 0 it's better to just divide and make it cos
you use that R thing when it's acosx + bsinx = c where c isn't 0
turbid ivy
I have fx991cw
old one was much better