Question

P. T

Tan13 A =Tan 4 A +Tan9 A +Tan4 A. Tan 9 A. Tan13 A

Tan 28° + Tan 72°+ Tan 80°= Tan 28°. Tan 72°.Tan 80°

Answer 1

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Answer 2

Hi mate hope these both attachment will help you..

if you will face any doubt at any point can ask me...