Home
Class 11
MATHS
In a triangleABC prove that cos2A+cos2B+...

In a `triangleABC` prove that `cos2A+cos2B+cos 2C=-1-4cosAcosBcosC`

Promotional Banner

Similar Questions

Explore conceptually related problems

IF A,B,C are angles of a triangle , Prove that cos2A+cos 2B+cos 2C=-4cosAcosBcosC-1

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

If A+B+C = pi , prove that : cos2A +cos2B +cos2C =-1-4cosAcosBcosC .

If A+B+C = pi , prove that : cos2A +cos2B +cos2C =-1-4cosAcosBcosC .

If A+B+C=pi , prove that cos 2A +cos 2B +cos 2C=-1-4cos A cos Bcos C.

If A+B+C=pi , prove that cos 2A +cos 2B +cos 2C=-1-4cos A cos Bcos C.

If A, B, C are angles of a triangle , prove that cos 2A - cos 2B + cos 2C =1 -4 sin A cos B sin C

If A, B, C are angles of a triangle , prove that cos 2A+cos 2B -cos 2C=1-4 sin A sin B cos C

If A+B+C=pi , prove that : cos2A+cos2B+cos2C=-1-4cosA cosB cosC

In DeltaABC , prove that: cos2A+cos2B-cos2C=1-4sinAsinBcosC