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tan A + tan(60+A) - tan(60 -A) = 3 tan3A...

`tan A + tan(60+A) - tan(60 -A) = 3 tan3A`

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tan A+tan(60+A)-tan(60-A)=3tan3A

Prove that : tan A+tan (60^@+A)-tan (60^@-A)=3 tan 3A .

Prove that: tan A+tan(60^(@)+A)-tan(60^(@)-A)=3tan3A

Prove that tanA+tan(60^@+A)-tan(60^@-A)=3tan3A

Prove that: tanA + tan(60^(@)+A) + tan(120^(@)+A)=3tan3A

Prove that: tanA + tan(60^(@)+A) + tan(120^(@)+A)=3tan3A

Prove that: tan A+tan(60^(@)+A)+tan(120^(@)+A)=3tan3A

Prove the following: tanA+tan(60^@+A)+tan(120^@+A)=3tan3A

Prove that: (i) cos A cos(60^(@)-A)cos (60^(@)+A)=(1)/(4)cos 3A (ii) "tan" A+"tan"(60^(@)+A)-"tan"(60^(@)-A)=3 tan 3A .

Prove that tan A. (tan 60^(@) +A). Tan (60^(@)-A)=tan 3A and hence find the value of tan 6^(@) tan 42^(@) tan 66^(@) tan 78^(@) .