Home
Class 11
MATHS
In triangleABC,A+B+C=pi,show thatcos^2A+...

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

Promotional Banner

Similar Questions

Explore conceptually related problems

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

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

In triangleABC,A+B+C=pi ,show that cosA+cosB-cosC=4cos(A/2)cos(B/2)sin(C/2)-1

If A+B+C=3pi/2 then cos2A+cos2B+cos2C=1-4sinAsinBsinC

In triangleABC,angleC=2pi/3 ,then prove that cos^2A+cos^2B-cosAcosB=3/4

If A+B+C=pi , then cos 2A+cos 2B+cos 2C=

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)

In triangleABC,A+B+C=pi ,show that sinA+sinB+sinC=4cos(A/2)cos(B/2)cos(C /2)

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

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