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tan20°+tan10°/1-tan20°tan10°=?

Deathstroke_rule  Apr 19, 2017
 #1
avatar+89953 
+2

Note DSR

 

tan (A + B)  =  [ tan A   + tan B]  /  [ 1 - tanA tanB]

 

So  if A  = 20°   and B  = 10°  we have

 

tan ( 20° + 10°)  =   tan (30°)    =  √3 / 3

 

 

 

cool cool cool

CPhill  Apr 19, 2017

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