  B = X37SINX4SINXSINA SINASINASIN5AA7SINCOS7AACOSCOSXA3CO...

Bài 2: Rút gọn:







B =

x

3

7

sin

4

A

sin

a

5

cos









0

x







1

2

45

2







4

x

D

sin

2

2



cos

2

x

C

cos

x

2

x

2

x

2

3

2

2



F =

E =

)

g

cot

(