Asked by Rileigh

If sin(θ)=8/10, 0≤θ≤π/2, then
cos(theta)=
tan(theta)=
Sec(theta)=
Please explain how to do this
Answered by Steve
Recall that

sinθ = y/r
cosθ = x/r
tanθ = y/x

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