Question

Prove that:
1- 2 sinA.cosA ≥ 0​

Answer 1

Step-by-step explanation:

1-2sinAcosA=1-sin2A

-1<sin2A<1 multiple every side with - 1

-1<-sin2A<1 add every side 1

0<1-sin2A<2 or equal to 0 and 2