2006-II-44
Ans: A
$\begin{array}{rcl}
3\cos^2 x -4\cos x +1 & = &#
… Read $\begin{array}{rcl}
3\cos^2 x -4\cos x +1 & = &#
HKCEE
2006-II-45
Ans: C
… Read Note that each faces of the tetrahedron are equilater
2006-II-46
Ans: B
In $\Delta OBC$,
… Read In $\Delta OBC$,
$\begin{array}{ll}
OB=OC & \t
2006-II-47
Ans: B
Join $OB$.
… Read Join $OB$.
In $\Delta OAB$,
$\begin{array}{ll}
OB = B
2006-II-48
Ans: D
Note that the inscribed circle of the $\Delta ABO$ is t
… Read Note that the inscribed circle of the $\Delta ABO$ is t
2006-II-49
Ans: D
I must be true. Note that $\Delta ABC$ is an isosceles t
… Read I must be true. Note that $\Delta ABC$ is an isosceles t
2006-II-50
Ans: A
Note that the centre of the circle
… Read Note that the centre of the circle
$\begin{array}{cl
2006-II-51
Ans: C
Join $BC$ and add a point $D$ on $y$-axis such that $AB\
… Read Join $BC$ and add a point $D$ on $y$-axis such that $AB\
2006-II-52
Ans: B
Note that the sample space is
… Read Note that the sample space is
$\begin{array}{|c|c|c
2006-II-53
Ans: B
$P\text{(the 2nd correct $|$ at least one correct)}$
… Read $P\text{(the 2nd correct $|$ at least one correct)}$
2006-II-54
Ans: D
The mean of the five numbers
… Read The mean of the five numbers
$\begin{array}{cl}
= �