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tan(9pi/8) what is the exact value?

 Dec 18, 2018
 #1
avatar+3715 
+2

tan(9pi/8)=\(\sqrt{2}-1\) or \(\approx 0.41421356\)

.
 Dec 18, 2018
 #2
avatar+94277 
+2

tan (x / 2)  =  csc x - cot x

 

So...

 

tan (9pi/8) =

 

csc (9pi/4) - cot (pi/4)  = 

 

csc (pi/ 4)   - cot (pi/ 4) =

 

sqrt (2) - 1

 

As tertre found   .....!!!

 

 

cool cool cool

 Dec 18, 2018
 #3
avatar+3715 
+2

Thanks, CPhill! 

tertre  Dec 19, 2018

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