Question

if tanA=1/2 and tanB=1/3 then coa2A​

Answer 1

Answer:

3/5

Step-by-step explanation:

Cos 2A = 1 - tan^2 A / 1 + tan^2 A

tan A = 1/2

Putting value of tan A

1 - (1/2)^2 / 1 + (1/2)^2

= (3/4) / (5/4)

= 3/5

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