2 . Let
11 tan� �� , where 3 � ��
� 2�
.
5 2
3 . Let
( a ) |
5 Show that cos� �
.
6
|
( b ) |
Using trigonometric identities to find sin� . |
4 625cos � � 256
3�
, where � ��
� . 2
[ 2 ]
[ 3 ]
4
( a ) ( i ) Write down the value of
2
cos � .
( ii ) Hence , find sin� .
( b ) Find tan� .
[ 4 ]
[ 2 ]
4 . Let
2 81 tan � � , where � is obtuse .
1600
( a ) ( i ) Write down the exact value of tan� .
( ii ) Hence , find sin� .
( b ) Find cos� .
[ 3 ]
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