Prove that tan(x) = sin(x)/cos(x)
sin(x) = (0/H)
cos(x) = (A/H)
Then sin(x)/cos(x) =
(O/H)/(A/H) =
(O/H)*(H/A) =
(O/A) = tan(x)
So sin(x)/cos(x) = tan(x)
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