Question

Prove that tan (45 -A) tan (45+A)=1

Answer 1

hope this helps you for getting answer

Answer 2

tan(45+a)*tan(45-a)=
cot(90-(45+a)) * tan(45-a) = cot(45-a) * tan(45-a) = 1. {as cot a° * tan a° =1}