Converting line slopes to angles

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Hi! I'm examining the equality between line slopes and angles. I've, using trig, conclude that this equation holds:
sin(v) = \frac{m}{ \sqrt{1+m^2}}
Anyone knowing a simpler equation is very welcome to post.
 
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\tan{\alpha} = m.
 
Ahhh! Why wasn't I thinking about THAT? I congratulate you for your clevernes.
 

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