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avatar+389 

What is the value of tan(π+x)tan(π+x) ?

I came up with the second answer..... 

 Mar 4, 2018
 #1
avatar+99592 
+1

tan (pi + x)  =

 

tan x  +  tan pi

_____________   =

1  -  tan x tan pi

 

 

(2/5) + 0

__________     =

 1  -  (2/5)*0

 

 

2/5

 

 

cool cool cool

 Mar 4, 2018
edited by CPhill  Mar 4, 2018
 #2
avatar+18078 
+1

Sin (x ) and  sin (pi + x) have the same BUT negative values

cos (x ) and  cos (pi+x)  have the same values but NEGATIVE

 

so  tanx  =  sin x / cos x

      tan (x+pi) = -sinx / -cosx  = sinx/cos x  = 2/5

 Mar 4, 2018

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