(Q3)
i. If tan X =
5
12
, then find sec x.
Given tan x =
5
12
We know that sec
2
x – tan
2
x = 1
sec
2
x = 1 +
2
x
sec x = √1 +
2
x
= √1 + (
)
2
= √1 +
= √
144 +
= √
=
Clear