If sin(θ)=8/10, 0≤θ≤π/2, then

Question

cos(theta)=
tan(theta)=
Sec(theta)=
Please explain how to do this

Answer 1

Recall that

sinθ = y/r
cosθ = x/r
tanθ = y/x

you have a triangle in QI where
y=8
x=6
r=10