Mathematics: Post your doubts here!

[queen of the legend]

Angle COD=Angle CED=38

the intersection of line OD and EC, let’s name it M

EMD is 90 degrees. So now EDO= 180-38-90

EDO=52

 

[usama yaseen 614]

View attachment 39176

First equal that base 9=3^2 and then 3^4x2 x 3^x =3^n
8+x=n

 

[usama yaseen 614]

View attachment 39157 method of solving for this ?

A):Sin(x)=cos(x)
Take the point where both of them r intersecting i.e. 45
B): as sin(x) -cos(x) = 0.5 And in y axis 0.5 r 10 units so cheek the Graph for 10 units difference between both graphs and i.e.
On the point 66

 

[drugdealar106]

View attachment 39143what is angle EDO?

BOC= 90-38= 52
CBO= 180 - 52/ 2 = 64
ECB= 180-64 = 116
OAE= 180-116= 64
AOE= 180-64-64= 52
EOD= 90 - 52 = 38
EDO= 180-38/2 = 71

DONE

 

[queen of the legend]

BOC= 90-38= 52
CBO= 180 - 52/ 2 = 64
ECB= 180-64 = 116
OAE= 180-116= 64
AOE= 180-64-64= 52
EOD= 90 - 52 = 38
EDO= 180-38/2 = 71

DONE

i did not understand from OAE

 

[queen of the legend]

 

[queen of the legend]

i dont understand when to use ln or log. can someone please explain. for example
find inverse of f(x)= 2^x

 

[usama yaseen 614]

i did not understand from OAE

thats simple just draw a tangent AE and angle OAE and because of taht radius both angles r same so AOE than draw an imaginary line EO n than EOD AND he divide 38 by 2 cause OE and OD r radius so angle will be same

 

[drugdealar106]

i did not understand from OAE

I found OAE 180-116= 64 from the properties of circle that says "The sum of opposite angles of a quadrilateral are equal to 180"... its necessary to find OAE if we want to find EOD which is necessary if we want to find EDO...

 

[drugdealar106]

i dont understand when to use ln or log. can someone please explain. for example
find inverse of f(x)= 2^x

Neither do i know about that.. but some questions come like "2^2x=4^2 Find X?" ... i just make the base same of the both sides... the answer will be
= 2^2x =2^4
=2x=4
x=4/2=2..

i dont have any idea how to use log and in.. if u know anything about it please tell me...

 

[queen of the legend]

question part iv
the answewr is 5/6 how?

 

[drugdealar106]

View attachment 39212View attachment 39213

It is an equlateral triangle so all angles will be 60..

its a quadrilateral so 180-60=120

 

[drugdealar106]

View attachment 39230 question part iv
the answewr is 5/6 how?

(i) 4/6
(ii) 3/6
(iii)2/6
(iv)3/6+2/6= 5/6 (According to me the question say that we have to find shaded section 1 or a section numbered 1. So its easy to find like this. However, if we take the question the other way i.e. shaded section or a section numbered 1, the answer comes 7/6 which is not possible because probability can never be more than 1.)

 

[queen of the legend]

some one please help me with transformation matrices and how do we get to know the martix that maps one to other? any video ? guide anything ?

 

[usama yaseen 614]

Neither do i know about that.. but some questions come like "2^2x=4^2 Find X?" ... i just make the base same of the both sides... the answer will be
= 2^2x =2^4
=2x=4
x=4/2=2..

i dont have any idea how to use log and in.. if u know anything about it please tell me...

I think so log and ln r not in the syllabus and if there is any question in past papers then post it here with year name

 

[usama yaseen 614]

which pa

View attachment 39146 how is this drawn? can anyone do it on paint ?

which year

 

[drugdealar106]

some one please help me with transformation matrices and how do we get to know the martix that maps one to other? any video ? guide anything ?

There are specific types of matrices given in D4. If u have that book, search for it in it... It is given for every type of transformation either it be on y-axis as invariant or x-axis as invariant. If u have that book, search for it otherwise i will post it in here..

 

[Evangeline]

Hello, can anyone please give me tips or advice on how to revise for maths paper 2 and 4. I did a lot of practice but seem to get the same mark every time. My major problem is in Transformations ( Rotation, Reflection, Enlargement, Stretch and Shear) and matrices used in transformation. Can someone please help me by posting a good revision book or link? Thanks

 

[queen of the legend]

There are specific types of matrices given in D4. If u have that book, search for it in it... It is given for every type of transformation either it be on y-axis as invariant or x-axis as invariant. If u have that book, search for it otherwise i will post it in here..

found it in the addendum. thank you. i am doing the IGCSE's not O level thats why i thought this book is not the one to look at. but surprisingly enough the O level books i find are much better than IGCSE ones.

 

[A star]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s11_qp_31.pdf 8 part(ii) part (iii)