Examine the continuity of f, where f is defined by
sin
cos , if
0
( )
1,
if
0
x
x
x
f x
x
−
≠

= −
=

Find the values of k so that the function f is continuous at the indicated point in Exercises
26 to 29 26 cos , if
2
2
( )
3,
if
2
k
x
x
x
f x
x
π

≠
= π −
π

=

       at x = 2
π
27 2, if
2
( )
3,
if
2
kx
x
f x
x

≤
= 
>

            at x = 2
28