Question

sinx=4/5 = sec x/sin x = ?

Answer 1

sec x =1/cos x
sinx=4/5 ,
cos x =3/5
secx=5/3
and then
secx/sinx=5/3|4/5
:5/3×5/4=25/12

Answer 2

sec x = 1/cos x

sinx = 4/5

cos x= 3/5

sec x= 5/3

Now

secx /sinx = 5/3 | 4/5

So, 5/3 × 5/4 = 25/12