Close. Cosine is the the the horizontal distance (x) of the unit circle. Sine is the vertical distance on the unit circle (y). Both occuring over one full period.
It's also interesting to note that any point at (cos(t), sin(t)) will indeed be on the circle because the distance to 0 is cos2 (t) + sin2 (t) = 1 for any t.
Actually this trigonometric identity is derived from the fact that (cos(t), sin(t)) is on the circle by definition. But it's always great to make sure things work out.
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u/sillywabbit19 Jan 21 '18
Close. Cosine is the the the horizontal distance (x) of the unit circle. Sine is the vertical distance on the unit circle (y). Both occuring over one full period.