How do you solve this?

Sec ( arc tan( 3/4) =

It is best to graph a right triangle

Mark one leg 3, and other 4 , then the hypotenuse is

√ ( 3^2 + 4^2 ) = 5

Sec of the angle whose tangent is 3/4 = 1/ Cos ( arctan 3/4) = hypotenuse/ side adjacent

= 5/4

Sec ( arctan( 3/4) = 5/4