Question

If 2Cos?B - 1 = Tan? A then Cos AcosB =

Answer 1

Answer:

SinA+CosA whole by 2

Step-by-step explanation:

given,

2cosB-1=tanA

= 2cosB= tanA+1 (by expanding tanA)

= 2cosB= sinA+cosA/ cosA

= cosAcosB= sinA+cosA /2

Answer 2

Answer:

2 Cos^2 B -1 = Sec^A-1

2 Cos^2B = 1/Cos^2A ---- Cos^2A × Cos^2B=1/2

CosA × CosB = +- 1/√2

Mark as Branliest and follow me