Question

Given that sin theta = 4/5 then find the value of cos theta​

Answer 1

Answer:

cosθ = 3/5

Step-by-step explanation:

(sinθ)^2 + (cosθ)^2 = 1

(cosθ)^2 = 1 - (sinθ)^2

(cosθ)^2 = 1 - (4/5)^2

(cosθ)^2 = 1 - 16/25

(cosθ)^2 = 9/25

cosθ = 3/5

Answer 2

Answer:

Step-by-step explanation:

Given sin theta  =4/5

Formula of sin theta=Opposite/Hypotenuse

From phytagorean theorem we know that (Hypotenuse²=Opposite²+Adjacent²)

so (5²=4²+X²) lets assume adjacent as X

from the above equation we get adjacent²(X)² as 9

which means adjacent=3

Now cos theta=adjacent/hypotenuse so

cos theta -3/5

Thank you