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Title: y


1
?????????
1. ???????
??
(1) A?B?O ?????
y
B
?
?
x
1
O
A
???????
To be continued ? (2) A?B ???? (3) A?B?O ????
2
???????
(2) A?B ?????? ? ? ?
1?
1?
To be continued ? (3) A?B?O ????
3
???????
(3) A?B?O?????? ? ? ? 180? (? ? ? ? 180?)?
?1?
?1?
????
4
2. ???????
??
????
5
3. ????????
??
To be continued ? (2) sin ( ? ? ? )
6
(2) ???????
??
????
7
4. ??
y
?
3
5
?
x
O
4
y
5
13
?
x
O
?12
Lets do an exercise !
8
????.
y
?
?
?3
x
O
5
y
?4
?
7
O
x
25
?24

9
5. ?????,????????
D
?
1
C
1
?
?
B
A
1
E
Lets do an exercise !
10
????. ???,ABCD ???????,
C
?
D
15
20
7
?
24
?
A
B
25
225

11
6. ??
????????
?
A
6
C
B

12
7. ??????????
(1) ???????
??
?? cos?sin? ?
To be continued ? (2) tan (? ? ? )
13
(1) ???????
(2) ???????
??
????
14
8 ?????,? 3 ??????????????,
? ?FBE ?,?FCE ? ,?FDE ?,
? (1) tan(??)??? (2) ? ? ? ????
A
H
G
F
?
?
?
?
E
B
C
D
1?
90??
Lets do an exercise !
15
????. ??,?ABC ? ?ECD ???????,
E
? (1) tan?ACE ??? (2) ?ACE ????
4
5
?
A
?
1
?
?
D
B
3
C
3
y
3
3?
? 3?
?
x
O
?1

16
9 ?????,? 6 ??????????????,
? tan?PBQ ???
A
?? ?ABP ?,?CBQ ? ,
P
Q
?
?
?
?
C
B
5
??
3

17
???????
1. ???????
??
??
????
18
2. ????????????????????,
??????????????? 8,
?
D
8
C
B
30?
15?
15?
A
O
Lets do an exercise !
19
????. ?????,??? O ????????????
A(1, 0),B,C,
??????? OAB ?
? ?OAC ????
?
y
(cos2?, sin2?)
C
(cos?, sin?)
B
?
?
x
O
A(1,0)

20
3. ???????
??
??cos 2? ?????
????
21
4. ?????,????? ABD ?,?A ???,
D
?ABD ? 2?ABC,
?
x
C
6
?
?
B
A
5
Lets do an exercise !
22
????.
y
?
x
?
O
3
?2

23
5. ???????
??
Lets do an exercise !
24
6. ??? ? ???,
? tan? ???
?
Lets do an exercise !
25
????. ? tan? ? tan? ???? 7x2 ? 8x 1 0 ???,
?

26
7. ??
?

27
?. ?????
1. ?????
?????cos3? 4cos3? ? 3cos? (????? 3 4?3 ? 3?
)
??cos3? cos(2? ?)
cos2?cos? ? sin2?sin?
(2cos2? ?1)cos? ? (2sin?cos?)sin?
2cos3? ? cos? ? 2(1?cos2?)cos?
4cos3? ? 3cos??
?????sin3? 3sin? ? 4sin3? (?? cos3? ????)
??sin3? sin(2? ?)
sin2?cos? cos2?sin?
(2sin?cos?)cos? (1?2sin2? )sin?
????
3sin? ? 4sin3??
2sin?(1?sin2?) sin? ? 2sin3?
28
? sin3? cos3? ???
2. ??
?

29
3. ??? sin18? ???
?? ? 18? ? 5? 90?
? 2? 90? ? 3?
? sin2? sin(90? ?3?) cos3?
2sin?cos? 4cos3? ? 3cos?
?? cos? ? 2sin? 4cos2? ? 3
2sin? 4(1?sin2?) ? 3
??? 4sin2? 2sin? ?1 0

30
4. ??? f(x) 8x3 ? 6x 1,
??????f(x) ?? (ax ? b) ????

31
5. ?? ?? ? ABC ?,
? ?A ? 2?C,
lt 99?? gt
A
?
2?
x
2
??????
?
B
C
3

32
?. ????
1. ??????
??
????
????
33
2. ??????
??
????
To be continued ? ??
34
??
????
35
3. ??
?
Lets do an exercise !
36
????.
?
?????
2?

37
4. ?????,A,B,P ?????? O ???????,
? P ????
y
?
P
x
O
A(1,0)

38
5. ???????
??
To be continued ? ? ?
39
??
?

40
6. ??????
??
????
?????????
????
41
7. ??
?

42
8. ??
?????????
?
0 ?
? 6 ?
? ? ? ?
43
(No Transcript)
44
? ?
? ?
?1?

??? ??? ??
????
Lets do an exercise !
To be continued ? ? ?
To be continued ? ? ?
45
(No Transcript)
46
1. ???????
(2) A?B?????? ? ? ?
(3) A?B?O?????? ? ? ? 180? (? ? ? ? 180?)?
????
47
(No Transcript)
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