JEE CENGAGE Book Problem| If cotA/2, cotB/2, cotC/2 are in A.P.,then show that a,b,c are in A.P.

JEE CENGAGE Book Problem| If cotA/2, cotB/2, cotC/2 are in A.P.,then show that a,b,c are in A.P.

If the cotangents of half angles of a triangle are in A.P., then prove that the sides are in A.P.


"Triangle Geometry Proof for 11th, 12th, JEE, and Engineering CETs!

Prove that if the cotangents of half angles of a triangle are in Arithmetic Progression (A.P.), then the sides of the triangle are also in A.P.

This video covers:

Understanding the problem statement
Applying trigonometric identities (cotangent half-angle formula)
Step-by-step proof
Conclusion and implications

Perfect for students preparing for :

JEE Main and Advanced
Engineering CETs (IIT, BITSAT, etc.)
CBSE and ICSE boards (11th and 12th)
Mathematics and physics Olympiads




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JEE math tutorials
Engineering math preparation
CBSE and ICSE math solutions
Trigonometric identities
Cotangent half-angle formula
Arithmetic progression proof
Geometry theorems
Math challenge
Geometry puzzle