Question
Evaluate, tan 17°  tan 32°  + tan 32°  tan 41°Â
+ tan 41°  tan 17°  =?Solution
We know that If A + B + C = 90°  or π/2 Then tan A tan B + tan B tan C + tan C tan A = 1 = 17 + 32 + 41 = 90° Then, tan 17°  tan 32°   + tan 32°   tan 41°   + tan 41°   tan 17° = 1
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