Class of 2025 (2025 HSC CHAT) (3 Viewers)

Study to success

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also i legit spent like 40+ minutes total yesterday across the idk, like 9-10 hours of maths, ranting about the uselessness of this:
View attachment 48232

like whoever decided that they would format all their equations using this USELESS formula should go fuck themselves... idk if i should actually get into what i mean cuz i rlly gotta get back to intro to calc 😭
Ikr. I can’t believe some people like trig
 

Socialism

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ohh yeah that could be simplified so easily... just learn ASTC and how to do each angle, that's it. overcomplication at its finest right there
LITERALLY OMFG YES YOU GET IT RIGHT AWAY... just remember astc and the equation for each quadrant
but it really annoys me that they write questions like that too
because it really shouldn't be, say, sin(180-theta) = theta, the formula really should be 180-x = theta or whatever and forget the rubbish... because if you actually look at what you have to do to use that formula to work it out, YOU LITERALLY CAN'T USE THE VALUE THEY GIVE YOU IN THAT FORMULA. SO YOU HAVE TO DO 180-X ANYWAY 😭

honestly, idk how you'd represent sin, cos and tan, but HERE'S a formula that ACTUALLY WORKS and YOU CAN PUT THE NUMBER THEY GIVE YOU INTO IT

1st quad, x=theta
2nd quad, 180-x=theta
3rd quad, x-180=theta
4th quad, 360-x=theta

because when you get a question like, "find the exact value of cos240" you can't put 240 anywhere into that equation. you HAVE TO TAKE 180 OFF THO!! so hence my new and improved equation... 240-180=theta bam you have your answer...
 

Study to success

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LITERALLY OMFG YES YOU GET IT RIGHT AWAY... just remember astc and the equation for each quadrant
but it really annoys me that they write questions like that too
because it really shouldn't be, say, sin(180-theta) = theta, the formula really should be 180-x = theta or whatever and forget the rubbish... because if you actually look at what you have to do to use that formula to work it out, YOU LITERALLY CAN'T USE THE VALUE THEY GIVE YOU IN THAT FORMULA. SO YOU HAVE TO DO 180-X ANYWAY 😭

honestly, idk how you'd represent sin, cos and tan, but HERE'S a formula that ACTUALLY WORKS and YOU CAN PUT THE NUMBER THEY GIVE YOU INTO IT

1st quad, x=theta
2nd quad, 180-x=theta
3rd quad, x-180=theta
4th quad, 360-x=theta

because when you get a question like, "find the exact value of cos240" you can't put 240 anywhere into that equation. you HAVE TO TAKE 180 OFF THO!! so hence my new and improved equation... 240-180=theta bam you have your answer...
I thought for the 3rd quad it’s 180+theta
 

Socialism

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180+thera
but no, its not... you get 240, then to find theta, you take 180 off!! SO ITS ACTUALLY X-180 !!! LIKE STEP THROUGH HOW TO DO IT
1. cos240 so quad 3 and negative
2. x-180 = theta
3. 240-180 = 60
4. theta = -60 because 3rd quad cos negative
 
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Study to success

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but no, its not... you get 240, then to find theta, you take 180 off!! SO ITS ACTUALLY X-180 !!! LIKE STEP THROUGH HOW TO DO IT
1. cos240 so quad 3 and negative
2. x-180 = theta
3. 240-180 = 60
4. theta = 60
Wait can’t u do 360-240 because cos is positive in the 4th quad which will give 120. Idk what I’m doing. Oh wait but then you’ll just have to minus it from 180 again
 

adammmaa

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Yo, where did that massive thread TyWebb made with all of last year's trials on it from the selective schools? It had like every paper on it
 

killer queen

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also i legit spent like 40+ minutes total yesterday across the idk, like 9-10 hours of maths, ranting about the uselessness of this:
View attachment 48232

like whoever decided that they would format all their equations using this USELESS formula should go fuck themselves... idk if i should actually get into what i mean cuz i rlly gotta get back to intro to calc 😭
I'm ngl I never memorised this I just imagine the graphs and pray 😭😭
 

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