Math, asked by lakshyasood05, 9 months ago

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

Answers

Answered by bhojarajuk75
0

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

Answered by atharv2303
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

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