伤城文章网 > 数学 > 第06天正弦定理的概念每日一题之快乐暑假高二数学(文)人教版Word版含解析

第06天正弦定理的概念每日一题之快乐暑假高二数学(文)人教版Word版含解析


06






1ABC

Aasin Absin B

Bacos Abcos B Casin Bbsin A

Dacos Bbcos A

2ABC a=8A=45B=60 b

A 2 3 2

B 4 6

C 4 3 2

D 4 4 3

3ABC ABC abc sinA 1 b 3 sinB a = 3

A3 3

B 3

C 3 2

D 3 3

1C2B3D

3

a



b

a b sin A

3 sin B 1 3

3 D

sin A sin B

sin B

sin B

3

1ABC ABC ab

c a = b = c sin A sin B sin C



2 ABC abc




1ABC ABC abc a 5 bA2B 2
sin B

A 5 3

B 5 4

C 11 4

D 5 6

2ABC A 2 a 3c b _____________

3

c

3 ABC A, B,C a,b, c b sin A 3a cos B

t a nB _____________

1C a b a 5 b sin A 5 A2B

sinA sinB

2

sin B 2

sin 2B 5 cosB 5 sin B 11 C*

sin B 2

4

4

21

sin A a sin C c

3

sin C



sin

2 3 3



1 2

C



6



B 2 b c b 1

3 66

c

3 3 a b bsin A a sinB b sin A 3a cos B sin A sin B

3a cos B a sin B tan B 3


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