Question

tan A =1/5, tan B=2/3 show that cos 2A=sin 2B​

Answer 1

Step-by-step explanation:

tanA=1/5 then sinA=1/√26,cosA=5√26

tanB=2/3 then sinB=2/√13,cosB=3/√13

cos2A=1-2sin^2 and sin2B=2sinBcosB

1-2(1/√26)^2 =2×2/√13×3/√13

1-(2×1/26) =2×(6/13)

1-1/13=12/13

12/13 =12/13

cos2A =sin2B

Answer 2

Answer:

you have to learn identity of

cos2theta and sin2theta

mark me as brainliest