Find the exact values of sin(θ/2), cos(θ/2), and tan(θ/2) for the given conditions.
sec θ =
5
4
; 0° < θ < 90°

sin(θ/2) =
cos(θ/2) =
tan(θ/2) =

well, the pythagorean theorem, gives us the +/- versions, so, which one is it?

well, our angle is at 0° < θ < 90°, meaning the 1st quadrant, and there, the opposite side, or "y" or "b", is positive, so is b = 9 then

now



thus


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