( a ) |
h( x) � g( f ( x)) |
( M1 ) for composite function |
|
� f( x)
� hx ( ) �5cos �
��2 � 2
�
|
( A1 ) for substitution |
|
|
�1
1� h( x) � 5cos � x �
��
2 �3
2�
|
A1 [ 3 ] |
|
( b ) |
The period of h 1
�2�
�
3
|
( M1 ) for valid approach |
|
�
6�
|
A1 [ 2 ] |
|
( c ) |
{ y: �3 � y� 7 }. |
A2 [ 2 ] |