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Prove that the trigonometric problem tan9°×tan99°=−1

Prove that    the trigonometric problem       
tan9°×tan99°=−1

Grade:11

1 Answers

Arun
25750 Points
5 years ago
Dear student
 
tan 99 = tan (90 + 9) =  – cot9
 
hence
 
tan 9 *  – cot 9 = – 1
 
Regards
Arun (askIITians forum expert)

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