Question

if a+b+c=pi then prove that COS3A.COS3B+ COS3B.COS3C+ COS3C.COS3A=1​

Answer 1

u find answer in photo math appp...... install the app and only algebra questions answer u find...... it gives the ans

Answer 2

Answer:

there is typing problem in your question ,replace the all cos are in cot then solve.