Question

If A+B=90 degree and sec A = 5/3 then find the value of cosec B.

Answer 1

A+B=90
90-A=B

NOW WE KNOW THAT SECA=COSEC(90-A)
SECA=COSEC(90-A)=COSECB=5/3

Hope it helps

Answer 2

A+B =90
A=90-B
Now.,
Cosec(90-A) =5 ÷3
Cosec(90-90+B)=5÷3
CosecB=5÷3