In a right angled `DeltaΑ BC, cos^2A +cos^2B cos^2C=`

In a right angled Delta BC,cos^(2)A+cos^(2)B cos^(2)C=

If A, B, C are the angles of a right angled triangle, then (cos^2A+ cos^2B+ cos^2C) equals

If in a triangle ABC, cos^(2)A + cos^(2)B + cos^(2)C =1 , then show that the triangle is right angled.

If DeltaABC is a right-angled at A, then: cos^2B+cos^2C=

If triangleABC is a right angled at A, then: cos^(2)B + cos^(2)C=

If A,B,C are the angles of a right angled triangle,then (cos^(2)A+cos^(2)B+cos^(2)C) equals

If in a Delta A B C ,cos^2A+cos^2B+cos^2C=1, prove that the triangle is right angled.

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 DeltaABC is a right angle triangle then prove that cos^(2)A+cos^(2)B+cos^(2)C=1iffsin^(2)A+sin^(2)B+sin^(2)C=2