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cos2a-cos2b+cos2c=1-4sinacosbsinc...

cos2a-cos2b+cos2c=1-4sinacosbsinc

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If A+B+C=180^(@) then prove that the following: cos 2A-cos2B+cos2C=1-4sinAcosBsinC

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

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

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

If A+B+C=180^(@) then prove that the following: cos2A+cos2B-cos2C =1-4sinAsinBcosC

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 : cos2A+cos2B-cos2C=1-4sinA sinB cosC

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 =-1-4cosAcosBcosC .