  
1.  =
;  =
;  =
;  =
;  =
;  =
2.
3.  :−

(
90 −
)
= cosθ

(
90−
)
= 

(
90−
)
=

(
90−
)
=

(
90 −
)
=

(
90 −
)
=
4.  :−
 × =1
 ×  =1
0
30
45
60
90

0
1
2
1
√
2
√
3
2
1

1
√
3
2
1
√
2
1
2
0

0
1
√
3
1
√
3


2
√
2
2
√
3
1

1
2
√
3
√
2
2


0
√
3
1
1
√
3

 × =1
 × =1

θ + cos
θ =1

θ − tanθ =1

θ − cot
θ =1
 =


 =


5.  :−
(
+
)
=
+
+ 2
(
−
)
=
+
− 2
−
=
(
−
)(
+
)
+
=
(
+
)
− 2 
(
−
)
+ 2
(
+
)
=
+
+ 3
+ 3
+
=
(
+
)(
+
− 
)
(
−
)
=
−
− 3
+ 3
−
=
(
−
)(
+
+ 
)