Not a Very Exciting Math Problem
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I just saw it on the main page of YouTube:

 tan (19°) = x
 tan (5°)  = ?

How do you solve it?
Well, you know that 95=19 X 5, right?
So, calculate the tangent of five times an angle.
Cool.
One more thing you should know is that 5 = 95 - 90.
That's a good place for me to stop.

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