+0  
 
0
136
2
avatar+163 

so tan(a) = 5/2 and tan b = 1/2 (2 angles on a triangle)

I want to add both angles - the sum formula for tangents is (a+b)/(1-a*b)

the issue is this is equal to -12

what am I missing here?

 Feb 3, 2023
 #1
avatar
+1

(a + b) / (1 - a*b)

 

(5/2  + 1/2) / (1  - (5/2*1/2))

(2.5  +  1/2) / (1  -  (1.25))

( 3 )  /  ( - 0.25) == - 12

 Feb 3, 2023
 #2
avatar+163 
+1

ok so the correct answer was -12 and I was overthinking it thank you!

YourAverageDummy  Feb 3, 2023

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