Mathematics: Post your doubts here!

[Suchal Riaz]

Okay Sir! Did you just believe it when you were told that? Should i simply believe it as well? ^^

there is only one way that a normal will touch a circle. that is being perpendicular to it. and which means having 180degree with radius. which means making one line which passes through centre.

 

[Suchal Riaz]

Hi guys,need help in solving an equation
sqr root of (-2+2sqr root 3i)
The answer is +-(1+i sqr root3)
Thank u

represent it in arg mod form and it becomes 4(cos (2/3 pi) + isin( 2/3 pi) )
giving us square root = 2(cos (2/6 pi) + isin (2/6 pi) )

 

[Namehere]

no one told me. i realised this rule just like newton realised the priciple of theorem of calculus.

Well, then you are a future Newton! Im a future Einstein so im not jealous of you (just kidding)

 

[Suchal Riaz]

Well, then you are a future Newton! Im a future Einstein so im not jealous of you (just kidding)

Einstein took years realising something as simple as relativity. it would have been obvious to me from childhood.

 

[Namehere]

Einstein took years realising something as simple as relativity. it would have been obvious to me from childhood.

Lets remember you didn´t know how to do the complex number question ^^

 

[Namehere]

Btw does anyone know where I can find chemistry winter 2013 examiner report?

 

[Suchal Riaz]

Btw does anyone know where I can find chemistry winter 2013 examiner report?

maxpapers.com or
onlineexamhelp.com/past-papers/cambridge-international-a-as-level/9701-chemistry-a-as-level-year-wise/9701-chemistry-a-as-level-2013

 

[Suchal Riaz]

Lets remember you didn´t know how to do the complex number question ^^

it's called complex for a reason

 

[Namehere]

maxpapers.com or
onlineexamhelp.com/past-papers/cambridge-international-a-as-level/9701-chemistry-a-as-level-year-wise/9701-chemistry-a-as-level-2013

There isnt any w13_er there...

 

[Suchal Riaz]

there aint er here either : http://maxpapers.com/category/qualifications/international/cambridge/a-level/a-level-chemistry-9701/
so it implies cie hasn't released any

 

[Namehere]

Got a question, for Q1(iii), why is tan(90-x) the recripocal of tanx?
http://maxpapers.com/syllabus-materials/mathematics-9709-a-level/attachment/9709_w13_qp_1/

Variant 2. Here i attach the marking scheme:

Thank you!

 

[Suchal Riaz]

Got a question, for Q1(iii), why is tan(90-x) the recripocal of tanx?
http://maxpapers.com/syllabus-materials/mathematics-9709-a-level/attachment/9709_w13_qp_1/

Variant 2. Here i attach the marking scheme:

Thank you!

 

[sitooon]

Suchal Riaz Try this
second part

 

[Suchal Riaz]

Suchal Riaz Try this
second part

View attachment 39173

it looks very complicated. and i give up

 

[sitooon]

it looks very complicated. and i give up

It looks so , but i gurantee you can get it

 

[Suchal Riaz]

It looks so , but i gurantee you can get it

tomorrow. now i can hardly open my eyes.

 

[Hassan Ali Abid]

Suchal Riaz Try this
second part

View attachment 39173

Thats the question from 2013 ppr ryt ???

 

[hamza.k143]

Here I attach my explanation (thanks to hamza.k143 who explained it to me):

My only remaining doubt is why or how do we know the line AB intersects at y= -1 (-i), because after that the rest is reasonably easy, its just that assumption I don´t get. So if anyone knows please let me know.

See there is no rule i just extended the line AB for my convenince to make it a triangle the original picture which i s3nd u i extendwd the line till center of the circle and named it D then if u notice a triangle was forming from which we could take out tje whole length AD and minus the radius of the inner circle to get shortest distance which is AB if any one doesnt get it just ask on skype or viber or something cux explaining it on comments is difficult

 

[hamza.k143]

Hi guys,need help in solving an equation
sqr root of (-2+2sqr root 3i)
The answer is +-(1+i sqr root3)
Thank u

Here u go mate

 

[hamza.k143]

It cant be 90 -angle it would be 90 +angle because total aum ina triangle is 180 and if u subtract the angle it couldnt be 90 -angle