Question

sin teta=4/5 then cos teta=​

Answer 1

Answer:

3/5

explanation :

sin teta = 4/5

ie; opposite side=4x

hypotenuse =5x

hence adjacent side=

$\sqrt{5x ^{2} - 4x {}^{2} }$

= 3x

hence cose teta=3x/5x

=3/5

Answer 2

Answer:

cos theta = 3/5

sin theta = perpendicular/hypotenuse = 4/5

let perpendicular be 4x and hypotenuse be 5x

so, h^2 = p^2 + b^2

(5x)^2 = (4x)^2 + b^2

b^2 = 25x^2 - 16x^2

b^2 = 9x^2

(b)^2 = (3x)^2

b = 3x

Cos theta = base / hypotenuse

= 3x/5x

=3/5

I hope it help you