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  1. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    arg(u*/u) means arg(u*)-arg(u) so arg(u*/u)=arg(u*)-arg(u) Find these arguments and you will be able to prove the equation.
  2. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Usually they tell us whether to use radians or degrees. For complex number questions, try to use radians always (since that's the conventional rule) but they do accept answers in degrees. For a question like this where it's unclear whether to use radians or degrees, just look at how reasonable...
  3. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    That works well too.
  4. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Because when we exclude both the batsmen and bowler, the batsman is still refusing to be in a team with a bowler but if they are not picked, they don't end up being in a team together anyways so the condition is met.
  5. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    You must find the combinations when only the batsman is being included in the squad(1st), only the bowler is being included in the squad(2nd) and when none of them are being included(3rd). 1st: 1C1(for the batsman having a confirmed place)*6C4*4C4(bowler has been excluded here)*2C1*2C1=60 2nd...
  6. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    For a blue pen to be in the left pocket once operation T takes place, a red pen must've been chosen from the left pocket followed by red pen from right pocket (1st) OR a blue pen chosen from left pocket and a blue pen chosen from right pocket(2nd). For 1st scenario: (3/4)*(4/5)=0.6 2nd...
  7. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Ok so we are trying to find out the radius of the (circle) complex number |z-4i| right? So how our earlier proof showed us that we need to square both the sides and gather the terms to show that one side of complex number is equal to the other. Basically, the proof zz*-2iz*+2iz-12=0 shows us...
  8. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    |z-10i|=2|z-4i| (z-10i)(z+10i)=4(z-4i)(z+41) - using the concept from first equation in (i) (z-10i)(z-10i)*=4(z-4i)(z-4i)* - now use concept from 2nd equation in (ii) (z-10i)(z*+10i)=4(z-4i)(z*+4i) zz*+10iz-10iz*+100=4(zz*+4iz-4iz*+16) 3zz*+6iz-6iz*-36=0 3(zz*-2iz*+2iz-12)=0 - first part proven...
  9. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Feeling lazy so won't solve it, just guide. You make any two equations and solve them simultaneously for example: P(39<X<63)=0.5 - since the probability of values lying between LQ and UQ is 0.5 so solve this and get answer for standard deviation(using mean from (i)) You may also use the...
  10. hellodjfos;s'ff

    Physics, Chemistry, Biology --------> Hardest Questions Compiled #A Level Version

    Does anyone have a compilation of the hardest paper 4 questions?
  11. hellodjfos;s'ff

    Physics: Post your doubts here!

    Haha relax dude, just tryna help out. I didn't even see your reply
  12. hellodjfos;s'ff

    Physics: Post your doubts here!

    No, you don't need an A in every paper to get an A*. You may have a D in a component and still achieve an A*(of course that requires you to score exceptionally well in the other components). If you look at the grade thresholds for physics, you need to get a raw score of 177 to get an A and 203...
  13. hellodjfos;s'ff

    Physics: Post your doubts here!

    I have the book. The book is good for revision of most topics, but the questions in the book are really easy so no point in doing them. Go straight to past paper questions instead.
  14. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    You may also use trial and error method to find all 3 factor but it would take way too long as you would have to write down all the working with it, plus it's unlikely that you'll get full marks for working.
  15. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Usually you try to factorise it by taking something common between 2 monomials and something else common between the other 2 monomials. That isn't the case here. So what you do is, you write that equation in your calculator, pick one of the answers and write down the factor theorem for it(this...
  16. hellodjfos;s'ff

    Physics: Post your doubts here!

    Usually those who retake it do get better grades because they're more serious. It really depends on what your grade was. If it was a low B or worse then definitely retake it but if it was a high B or better, don't retake it.
  17. hellodjfos;s'ff

    Physics: Post your doubts here!

    The theory threshold was higher than previous years. It was 45/60 this year when it's 41/60 usually. Paper 1 and paper 3 were average. The maths thresholds were incredibly high this year(45 on M1 and 65 on P1).
  18. hellodjfos;s'ff

    Tips to get A* in A'levels

    They have a scale on which each grade has a score out of 4 with A*/A being 4 and U being 1. Then they sum up the scores and divide it by the number of subjects to get your final GPA. Google the proper scale on which they score the grades.
  19. hellodjfos;s'ff

    Tips to get A* in A'levels

    Yeah you can easily end up on community colleges. Financial aid for such unis would be difficult to get still. It comes down to your extra curriculars really... just show the uni you are an all-rounded student and you're giving yourself a solid chance.
  20. hellodjfos;s'ff

    Tips to get A* in A'levels

    I remember that there was a senior in my school who had a sat score of 1100, 5As+rest Bs in olevels and 3Bs in alevels. He ended up getting into michigan state university for 80% financial aid because he had incredible extra curriculars(debating, sports, leadership positions).
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