Home
Class 12
MATHS
If A+B+C = pi, prove that : cos2A +cos2B...

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

Promotional Banner

Similar Questions

Explore conceptually related problems

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

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

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 = pi , prove that : cos2A-cos2B -cos2C = -1+4cosAsinBsinC

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

If A + B + C =pi , prove that : cos A + cos B - cos C> 1 .

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

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

If A+B+C=180^@ , then prove that cos2A + cos2B +cos2C=-1-4cosA cosB cosC .