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Mathematics: Post your doubts here!

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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... :)
 
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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.)
 
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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 ?
 
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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
 
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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..
 
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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
 
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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.
 
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