help

[knotty garden]

how does cos 30 work in all the quadrants to give 4 values

[frank girder]

wdym

U're asking how to use a cast line ???

[knotty garden]

usually

if i get like a sin value

it only works in the s and a quadrant

giving 2 values

[frank girder]

I just draw out the graphs bro. 😭

[knotty garden]

yh i get that

[frank girder]

I dont use cast diagram

[knotty garden]

oh

so u just draw

[frank girder]

just draw ou the graph

[knotty garden]

the

cos graph

but im asking abt cast graph

[frank girder]

yh that what I do.

[frank girder]

sorry mb bro I cant help

I thought it was just general trig 😭

can u use the graphs bro

[knotty garden]

i barely draw out the actual graph

i cant remmeber it

tbh

i use cast

[frank girder]

oh u need to learn that bro

It comes up a lot of times

[knotty garden]

ik it but

i get it wrong a lil

so ill just learn it

but im tryna figure out the cast graph too

in this scenario tho

[icy grail]

Cos you got the - root 3/2

[thorn crow]

which day is it from? the corbett maths and is it higher plus?

[strong crest]

Using trig identities turn the cos^2 into 1-sin^2 and from that u can work out that sin(x) = 1/2

Then use trig identities to turn sin^2 into 1-cos^2 and from that u can work out that cos(x) = sqrt(3)/2

Then from that u can infer your 4 values

[sonic pagoda]

nah its the daily corbett maths thingy for further maths

[sonic pagoda]

Cos x = +- root 3 over 2

so x = 30 degrees and x = 150 degrees

30 degree will equal 30 and 330 degrees (top right and bottom right quadrants)

then the 150 degree will fit into the top left quadrant (180 - 150) and also into the bottom left quadrant (180 + 30 = 210)\

so 30,330,150,210

[ashen sun]

cast is goofy

i would have saved time in practice exams when i did fm

[wet ridge]

icl just use the formula

[knotty garden]

its plur or minus

[knotty garden]

further maths

[knotty garden]

what formula

[icy grail]

Assumed u knew how to deal with the positive

[knotty garden]

this the part im asking abt

how do i infer w every question

like fhat

[strong crest]

I mean I just visualize it

But ik that's not easy

There are also some rules with this stuff

Like with sin values

At sin x

180-x will also equal x

For tan u just add 180

With cos u do 360-x

Do YK what I'm on about

Or have u not seen this before

Bcz I don't think I'm explaining it well 🔥🔥