Prove that:
1- 2 sinA.cosA ≥ 0
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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
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