Question

if cosA=4 by 5 then tanA =​

Answer 1

Step-by-step explanation:

CosA = 4/5

SecA = 5/4

tanA = √Sec²A - 1

= √(5/4)² - 1

= √(25/16) - 1

= √(25-16)/16

= √(9/16) = 3/4

Answer 2

cosA = 4/5 = adj side /hyp

(opp side) 2 +(adj side) 2 = (hyp) 2

o^2 + 4^2 = 5^2

o^2 +14 = 25

o^2 = 25-14 = 11

o = √11

therefore

tanA = oppside /adjacent side = √11 / 4

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