Given cos x = 0.8 what is sin x
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sin x = __

Now, notice g(x), and recall that



that simply means that the vertex for g(x) is at   

both parabolas are opening upwards, so they look like a "bowl", from up it goes down down down and reaches the vertex the goes back up up up.

the lowest point or vertex is a minimum, as low as it gets, so, which one is greater then?  f(x)'s which is (9, 8)   or g(x)'s which is (8, 9) ?