1988-11-22 — Page 33

華僑日報 All

二期星日二廿月一十八八九一)年七十七國民華中

(33)育教日四十月十年戊夏

tan tan(9+10)

1989 中學會考預習專欄

明德出版社— MILE & DALE PRESS

tani+tani - 0)

1-tan@tan( - 0)

1=

1---P

qp+1

(Proved)

Additional Mathematics (8)

Revision Exercise 8 Section A

W. S. So

Revision Exercise B Trigonometry II

Worked. Example:

1. If, are acute angles and

3sin2ad+2sin3%=1

3sin2-2sin2 -0

show that +24

Solution:

3sin2-1-2sin2=ccs22

34251 cos )=2sin?

sing 3sin.cos

cos(-2)=cos cos2g-simsin24

#cos 3sin-sinu3sing

1. If tans, tan23 and tan are in A.P.

Show that tan(f-y)=sin28..

2. Given that cotus of cots = 3 and

1.37 98 27. find the: waive of csc(+P).

3. 1f0d0ㄑㄑtand

cos(+coss-cos(<4%) > Find the values of and A.

4. Solve the equation

x2-( √2co@20°}x+{ cos220° – 11=9,

Write the roots in the form of sine.

5. Find the minimum value of

2cosx+3c0s2x.

報日僑華

{a} Find the ared

of triangles

ABAD, ABCC and

MABC in terms of p, q, (b) Hence show that sin(C+8] =sinicose+cose sing..

{c} Without usirig calculator,

evaluate sin75 ゚ in'surd form.

Solutions to Revision Exercise 8 1. tand, tanza, tans in A.P.

Land+tans 2tan2#

tan(4)

=

tek=2tan2s -tang

4tang *T-tane

= 50

csc+{x+k} = [5

- 5√2

3. cos(+cos-cos(+5) = 2

-2cos

(Ans.)

4cos - 4cos()cos(*) + 1 Acosed-Acos(2)cos(f)cos? (

=C0524

52) -

tana.

(2cos cos)2--sinf >

sin

= 0

_tōns(3+tang)

tan-tans

1+

(etanse

2tang

tan

•COS

sing

=0

since 0 4-2. <

6. Simplify +COSA

1-COSA

/1+COSA 1-COSA

where

sin

a +233 =

(Proved)

tans.

2cosд = cos0=0,

-

(Ans.)

7.

+tantan

tanel3+tanzs1

1-tanss tans(3+tan號)

tans mutarge

3tans+tan tang÷tan??

-tan2+3tan1s +tanj

2tans(1+tans)

COS33

2sinécoss

cose+sine

= sings

Without. using calculator, find the value of cos10°cps50°cos70, in surd form.

2. csc? (+8)=1+cot*(+6}

2. If tane and tan(-日) are the rootsf

of equation x2+px+q=0. Show that q=0+1.

Solution:

Sum of routs: tang-tan(-)--p

Product of roots: tana-tan(-6)=0

Section B

8. In the fiqune, ACLBD, ¿USA-A,

DBC=%, Aa=p, 3D-q and BC-r.

4. x?f(f2cos20°)x+(cos-20° - z)=0

x=VEcos20°±v2cos-20°-4cos*20°42

.

√2ca320°22(1-cos 20°)

cos20tin20°)

= sin45°cos20° ±cos45°sin200

(Proved)

=

sin(45°±20°)

.*. x-sin65° or sin25°

(Ans.)

coticots-1. cots +cols

5. y=2cosx+3cos2x.

-1

2cosx+3(2cosx-1)~ynd 6cosx+2cosx-(3+y)=0

+

1. Let's go on a

picnic,

B. won't you?

2. The soldiers'd

rather die than surrender

M. had they?

5.

1989 中學會考預習專欄

明德出版社一

MILL & DALE PRESS

2. They'd better

study their books,

3. Pass the sugar,

please,

C. doesn't it?

Suggestions to make

?

14. They should have

asked my permission

0. haven't

they?

English (8)

4.

They had hardly studied,

U

5. They luat

their fungir Together

F. aren't you?

6. Everytning gues

on fine,

G. do we?

7.

following

He never dare to cell lies,

they?

. C. is it

B.

The packer

commands the

I. haunt

they?

Dear Students,.

Today's issue 75 d revision "Question Tags". Basically, it is not a very difficult topic but some aspects

of it do pose problems for students.

好 complete ...Try

exercises.

the

.. cosx is real A=4+24(3+y) > ¤

76+24y 20

You and [ ought to have cooperated with each other, .....?

A. odorant you B. oughta't I C. ought ve D. oughtn't we

$uments hardly finished the

5. The

A.

didn t they B. did they

C.

6.

the minimum value of y is -19.

1-COSA +COSA IFCOSA 1-cosh

1-COSA)2 11+COSA) 1-cos-AM 1-cosA

[Ans.)

+

+

siná 2. STRA

1+COSA SinA

7.

B.

=4(cos60"+cos40°}ccs 70° 4(+cos40)cos70°

= 2cns70°+4cos40° cos70°

2cos702(cos 30+cos110°)

= 2cos70° b2cos30°-2cos700

= 2cos30°

(Ans.)

3 Area of ABAd = zpqsinc

Area of ABOC = Frosin

Area of AABC =

prsin(+7)

b) Area of 4ABC = Area of &BAD

+Area of ABOC

prsinte+/s) =zdqstinatzrqsins prsin(÷s)=pqsind argsins

sin{cop}= Jsine + Hsina

.*. sin(x) = simcosf+cosusina

c} sin75° = sin(30°-45°)

= sin30°cos456+sin45°cos30 c

+

(Ans.)

C. aren't [

0.

haven't I

13. John dared to cheat in the

-examination)...............?

A. dares he

C. did he

14. You need the

A.

do year C. need you

B.

daren't he D. didn't he

dictionary now, .....?

don't you

hadn't they D. had the b

7. You needn't do all the

.....?

A. need you C. do you

8. needn't you D. don't you

15. What a nice day,

D. needn't you

.....?

isn't it. B.

doesn't it D. is it

即供按揭。該花蔗地盤設有示忘單位。

無後七天內付旁。一次返付航式即供分期九五折,由金城银行提供九成 定後三天內付烨期二成,明年一月卅一日前再付一成,餘,七成既入伙

升特泰康刋特產地

白四

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欠理根,這也是該花巠請路比較緩慢的原因之一。

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例如助府只有一堂窗口恒,既要安裝油HLX要吸收陽光空氣,我在有 丶科於设戶對望,一來視野狹窄,做皮很多不明,且影有室内光綫 各號數單位因島與鄰成緊貼於排,只有一個觀景,另一面則與鄰室浴室 度結構性一批手型-第一、二、i、六號所、單位有二面散·邊,其 窗,廚房及浴室之地台舖地台純,腕

·永大厦平均每穴一千五百元左右,

R. don't we D. isn't it

(B) In each of the following questions, decide whether one of the four choices would most suitably complete the sentence if inserted at the place marked......

1. None of us know Italian, .....?

- A.

B. Jane said that she wouldn't came to

$

the party,.....?

A

did she

B. didn't she

2. I

C. would she.

D. wouldn't.she.

3.

星。 M

5: A

6. C

A.

had they

9. They'd like some tes, .....?

B. hadn't they

。品精的列系飾燈年:

. 7. 0

&. 凸

誠情的間房同不合配

A. has she

C. does she

B. hasn't she 3. doesn't she

agreed

A. does she C. has she

8. doesn't she D. hasn't she

2. Jane has a lot of homework to do,

12?

3. Nrs Wong nasn't

proposal yet. .....?

C. would they D. wouldn't they':

10. Nothing is difficult if you try,

.....?

A. is it C. do you

11. "Father, I wish to go to that show,

9. E

10. 3.

12. H

130

14.

N

8. isn't it n. don't you

(B) J

2.

D

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4. C

5. 6

...?

A. wish I

B. would I

C. may I

D. have I

8. E

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D

10,

A

旺油 翻讖

1.

12. C

13. !

14.

康泰服務最近

A. isn't it

B.

don tod

15.

A

(A) Choose the question tag from Colum

II which Best

the completes sentences in Column 1. Write the letter of the question tag in the speces provided. Each question.in Column I can be used only ONCE. The first one has been done for you as an examyte。

EX. You are students,

Letter Colum Il

A. don't they?

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