" A (6) "cot A+cot(60+A)-cot(60-A)=3cot3A

Prove that: cot A+cot(60^(@)+A)-cot(60^(@)-A)=3cot3A

Prove that: cotA+"cot"(60^0+A)-cot(60^0-A)=3cot3A

Prove that: cotA+"cot"(60^0+A)-cot(60^0-A)=3cot3A

Prove the following identity: cot A+cot(60^0+A)+cot(120^0+A)=3cot3A

Prove the following identity: cot A+cot(60^(@)+A)+cot(120^(@)+A)=3cot3A

cot alpha+cot(60+alpha)-cot(60-alpha)=3cot3 alpha

If A=60^(@) and B=30^(@) then prove that: cot(A-B)=(cot A cot B+1)/(cot B-cot A)

cot A + cot (60^(@) + A) + cot (120^(@) +A) = 3 cot 3 A.

"Prove that " cotA + cot ( 60^(@) + A) + cot (120^(@) + A) = 3 cot 3 A.

Evaluate : (cos^(2) 20° + cos^(2) 70°) + (cot 25^(@))/( tan 65^(@)) + cot 5° cot 10° cot 60° cot 80° cot 85°.