1, if
( )
cos ,
if
kx
x
f x
x
x
+
≤ π
= 
> π

         at x = π
29 1, if
5
( )
3
5, if
5
kx
x
f x
x
x
+
≤
= 
−
>

         at x = 5
30 Find the values of a and b such that the function defined by
5,
if
2
( )
, if 2
10
21,
if
10
x
f x
ax
b
x
x
≤
=
+
<
<

≥

is a continuous function 31