Question
Find the simplified value of: (tan 40 º  +Â
tan 20 º )/(1 - tan 40 º tan 20 º)Solution
We know that tan (A + B) = (tan A + tan B)/(1 - tan A tan B) (tan 40 º  + tan 20 º )/(1 - tan 40 º tan 20 º) = tan ( 40 º + 20 º) =  √3
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