Question

if A+B=90°and secA=5/3, then find the valur of cosec B.

Answer 1

A + B = 90o

A = 90o - B 

sec A = 5/3

Also

sec A = sec (90o​ - B)          (because A = 90o - B)
          = cosec B                  ​ 
          = 5/3
Hence, cosec B will also be 5/3