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Mathematics: Post your doubts here!

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plzz sum one solve my doubt!!!!urgently require the solution!!!i spent hal an hour for this sum!!!i know its toooo much bt dnt know.....
 

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Okay hey! I am not sure about how this works lol but anyways umm i have a silly doubt in this paper http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w03_qp_1.pdf
Question 6, part 1, i dont get how to show that answer, like i get 20/r - 2r and not 20/r - 2 :confused:
Can some one help me here, Thanks :)
ok, here is the answer..

the perimeter = 2r + rθ
20 = 2r + rθ
20 = r ( 2 + θ )
20/r = 2 + θ
20/r - 2 = θ

i hope you this helped u understand it.
 
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can sumbody solve this fast!!1


can sumbody help me with the second part first i have done!!!how to do second one
i got partial fractions like
A = 1

C = 8
B=4

and then partial fractions will be
1/(2x+1) + 4/(x-2) + 8/(x-2)^2


now the question is how to do the second part binomially expand????tried it bt a mistake somewhere!!!help
nightrider1993
leadingguy
smzimran
 

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