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Mathematics
Problem
Find the value of
k
k
k
, if
f
(
x
)
=
{
1
−
cos
2
x
1
−
cos
x
,
x
≠
0
k
,
x
=
0
f(x)=\begin{cases}\frac{1-\cos 2x}{1-\cos x}, & x \neq 0 \\ k, & x = 0\end{cases}
f
(
x
)
=
{
1
−
c
o
s
x
1
−
c
o
s
2
x
,
k
,
x
=
0
x
=
0
is continuous at
x
=
0
x = 0
x
=
0
. (M-16)
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