Tangent sum or difference

  • Thread starter big billy
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  • #1
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I am trying to find the exact value for tan(15). I figure my equation as 40 - 30 to give the 15.

when deriving my equation is where I have the problem. can anyone help please.

(1-√(3)/3)/(1 + 1 * √(3)/3)
 

Answers and Replies

  • #2
vela
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Looks good so far. To rationalize the denominator, multiply the top and bottom by (1-√(3)/3).
 
  • #3
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I am trying to find the exact value for tan(15). I figure my equation as 40 - 30 to give the 15.

when deriving my equation is where I have the problem. can anyone help please.

(1-√(3)/3)/(1 + 1 * √(3)/3)
[tex]40-30 \neq 15[/tex]
:redface:
I think you mean [tex]45-30[/tex]
:smile:
 

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