Question

A+B=90,THEN tanAtanB+tanAcotB UPON sinAsecB - sin^2B UPON cos^2A

Answer 1

I will tell you a short trick by taking the known values of angles.

Try with both
A=B=45 and or take alternatively 30 or 60 degrees and you will generate the answer.

Answer 2

Try with both
A=B=45 and or take alternatively 30 or 60 degrees

                 Hope it helped you...