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question mark

Prove that
tanA.tan(60+A)+tan(60+A)tan(60-A)
+tan(60-A)tanA=-3

Rajesh Agrawal , 10 Years ago
Grade 12
anser 1 Answers
Lab Bhattacharjee
\text{HINT : Use } \tan\{(60^\circ+A)-A\} \\ \tan\{A+(60^\circ-A)\} \\ \tan\{(60^\circ+A)+(60^\circ-A)\}
Last Activity: 10 Years ago
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