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

In triangleABC,A+B+C=pi , show that tan(A/2)tan(B/2)+tan(B/2)tan(C/2)+tan(C/2)tan(A/2)=1

In triangleABC,A+B+C=pi ,show that sin^2A+sin^2B-sin^2C=2sinAsinBcosC

In triangleABC,A+B+C=pi ,show that cos^2A+cos^2B-cos^2C=1-2sinAsinBcosC

In triangleABC,A+B+C=pi ,show that sin^2( A/2)+sin^2 (B/2)-sin^2 (C/2)=1-2cos(A/2)cos(B/2)sin(C/2)

tan 3A-tan 2A-tan A=

In triangleABC,A+B+C=pi ,show that cos2A+cos2B+cos2C=-1-4cosAcosBcosC

If A+B + C =180^(@), then tan A + tan B + tan C is equal to ................. A) tan A tan B tan C B) 2 tan A tan B tan C C) -tan A tan B tan C D) 1-4 tan A tan B tan C

The value of tan 3A -tan 2A -tan A is equal to....................... (A) tan 3A tan 2A tan A (B) -tan 3A tan 2A tan A (C) tan A tan 2A-tan 2A tan 3A-tan 3A tan A (D) none of these

If A+B+C=pi then (tanA+tanB+tanC)/(tanA tan B tanC) .......... A) 0 B) 2 C) 1 D) -1

If tan theta + 1/ tan theta = 2, then show that tan^2 theta + 1/tan^2 theta= 2 .