Soumendu Majumdar
Last Activity: 6 Years ago
Dear Student,
The question doesn't clearly state what is being divided by tan A, still, I’ll try to solve it by dividing only 2cos A by tan A & the whole expression by tan A
Now
if only 2 cos A is being divided by tan A then it is

now by Pythagorean triplets, we know

so cos A =

so

Hence

Now if the whole expression is divided by tan A, then
the expression becomes
=

Hope it helps!