# If A, B and C are the angles of a ABC, prove that Since A, B and C are the angles of a triangle, therefore sum of the angles equals 180°.

A + B + C = 180° C + A = 180° - B

Now, consider L.H.S. = = = = cot = R.H.S.

Hence, proved.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos  T- Ratios of Specified Angles58 mins  Quiz | Task on Trigonometric Ratios46 mins  Testing the T- Ratios of Specified Angles57 mins  Quiz on Trigonometric Ratios31 mins  Trigonometric Identities33 mins  Champ Quiz | Trigonometric Identities33 mins  NCERT | Trigonometric Identities52 mins  Trick to learn all Trigonometric Formulae28 mins  Nature of Roots of Quadratic EquationsFREE Class  Quiz on Number of Solutions of an Equation24 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation view all courses 