A) A =AASIN4 4 2 2ACOSCOS5− COS 2COS1(2Π ΠA)=−+XK24B) (TGA + TGB).C...

bài2: - TUYEN TAP DE THI LOP 11
Lớp 11 TUYEN TAP DE THI LOP 11

Bài2: a)

a =

a

sin

4 4 2 2

a

cos

5

−

 

cos 2

1

(

2

π π

)

=

+

x

k

24

b) (tga + tgb).cotg(a + b) + (tga -

tgb).cotg(a + b) = 2