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cos2B+cos2A-cos2C=1-4sinAsinBcosC...

`cos2B+cos2A-cos2C=1-4sinAsinBcosC`

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

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

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

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

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

cos2B + cos2A-cos2C = 1-4sin A sin B cos C

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

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

Prove that in triangle ABC , cos^(2)A+cos^(2)B-cos^(2)C=1-2sinAsinBcosC .