Home
Class 13
MATHS
[" Q.Prove that in a "Delta ABC],[cos2A+...

[" Q.Prove that in a "Delta ABC],[cos2A+cos2B+cos2C>=-(3)/(2)]

Promotional Banner

Similar Questions

Explore conceptually related problems

Prove that in triangle ABC , cos^(2)A + cos^(2)B + cos^(2)C lt 3/4 .

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

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

In Delta ABC, sum a^2 (cos^2 B-cos^2 C) =

Prove that in a triangle ABC, bc cos A + ca cos B +ab cos C= 1/2(a^2+b^2+c^2)

112. If in a Delta ABC,cos A+cos B+cos c=(3)/(2). Prove that Delta ABC is an equilateral triangle.

In a triangle ABC,cos^(2)A+cos^(2)B+cos^(2)C=

In Delta ABC , if cos ^(2)A +cos ^(2) B +cos ^(2) C =(3)/(4) , then the triangles is

In o+ABC, prove that cos A+cos B+cos C<=(3)/(2)