Find tan 19pi / 12 the exact value

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Using the addition or subtraction identities to find the exact value.
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your videos are amazingly helpful thank you! I can actually understand the steps of finding exact values. woot!

sir.raptor_teeth
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where does that "3" come from? the one that adds up to the "4" with the "1"?

Arya
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You just saved this sophomore from a world of hurt on his math test thank you!!!!

MrJUJUKOO