CHO 2A. COSΑ > 0 B. COT(Π + Α) > 0 C. TAN(Π + Α) <...

Câu 25.

Cho 2A. cosα > 0 B. cot(π + α) > 0 C. tan(π + α) < 0 D. sinα < 0

o

o

o

0

sin(x 30 )cos(30 x) sin(30 x)cos(x 30 )− + + + −