CGL 2012 Tier 2 Preparations and Results


@cbiofficer said:
bhai konsa ques h geo ka
A cyclic quadrilateral , PQRS is inscribes in a circle A tangent RT is drawn to it, /QRS=140; /SRT =??
@Brooklyn said: Maximum value of : (x+2)/2x^2+4x+8
@Brooklyn 1/4 ??
In a tri ABC tan A + tanB + tanC = 6 and
tan A.tanB = 3 then triangle is-
(A) Acute angled (B) Obtuse angled
(C) Right angled (D) Equilateral

plz explain
@mrudalmodi C ??
@mrudalmodi said:
If a sphere of radius r is divided into four
identical parts, then the total surface area
of the four parts is
(A) 4pie r^2
(B) 2pie r^2
(C) 8pie r^2
(D) 3pie r^2
@JS-M said:
1/20 ??
nop

@anurag1701 said:
@mrudalmodi C ??
logic yar plz

@Brooklyn said: Maximum value of : (x+2)/2x^2+4x+8
bhai option de do
else kafi bada ho jayega question

@anurag1701 said:
@Brooklyn 1/4 ??
approach plz
@JS-M said:
A cyclic quadrilateral , PQRS is inscribes in a circle A tangent RT is drawn to it, /QRS=140; /SRT =??
bhai isme kuch missing lg rha h muje
@gudda1122 said:
if 1/(x+1) + 2/(y+2) + 1009/(z+1009) =1 then d value of x/(x+1) + y/(y+2) +z/(z+1009)
options r 0,2,3,4
kindly please tell me which value you took and why?
x=-3,y=2,z=0
ans:2
@mrudalmodi said:
In a tri ABC tan A + tanB + tanC = 6 and
tan A.tanB = 3 then triangle is-
(A) Acute angled (B) Obtuse angled
(C) Right angled (D) Equilateral
plz explain
Obtuse.......
@gudda1122
@JS-M said:
approach plz
yar was given without options:

i solved using differentiation .....do u wann c dat?
@JS-M said:
approach plz
i think he has done this
x can't be less than (-2) because than answer will be negative
and at x=1 you will get 3/14
so maximum value will be at x=0

waise iska method bhi aata h but bahut bada hota h
@gudda1122 is it 2/3 of radius.
As total distance from the center will be 5/3
and the shortest distance will be 5/3r-r=2/3r

@JS-M said:
Obtuse.......
logic bhai?
@Brooklyn said:
@gudda1122
yar was given without options:
i solved using differentiation .....do u wann c dat?
by batana differentiation kaise use kiya???
@mrudalmodi 8
after diffrentiation:


1/2(x^2 + 2x + 4) - (x+2)(2x+2)/(2[x^2 + 2x + 4]^2)

equal to zero n solve :)
@Brooklyn said:
logic bhai?
yr answer to btao.......
@JS-M : uska max walle ka ans is 1/4

baki aap apna logic bhi to btao
@JS-M said:
Obtuse.......
acute diya ans..
how to solve?