In `DeltaABC`, prove that:
`tan2A + tan2B+tan2C=tan2Atan2Btan2C`

If A + B + C =180^@ , prove that : tan 2A + tan 2B + tan 2C = tan 2A tan 2B tan 2C .

If A+B+C=180^(@) , prove that: "tan"2A+ "tan"2B+"tan" 2C="tan" 2A "tan"2B tan 2C

In triangleABC,A+B+C=pi ,show that tan2A+tan2B+tan2C=tan2Atan2Btan2C

Prove that: tan7A-tan5A-tan2A=tan7Atan5Atan2A

Prove that: tan7A-tan5A-tan2A=tan7Atan5Atan2A

Prove that tan3A-tan2A-tanA=tan3Atan2AtanA

If A+B+C=pi , prove that (a) tan 3A+tan3B+tan3C=tan3A tan 3B tan 3C (b) cot""(A)/(2)+cot""(B)/(2)+cot""(C)/(2)=cot""(A)/(2)cot""(B)/(2)cot""(C)/(2)

In DeltaABC , prove that: s^(2).tan(A/2)tan(B/2)tan(C/2)=Delta

If A+B+C=pi, prove that (tan A)/(tan B tan C)+(tan B)/(tan Atan C)+(tan C)/(tan A tan B)=tan A+tan B+tan C-2cot A-2cot B-2cot C

If A+B+C=pi, prove that tan^2A/2+tan^2B/2+tan^2C/2geq1.